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* In ''Film/DarkSideOfTheMoon'', an overzealous CIA officer sends assassins after everyone involved in a MoonLandingHoax.


* In ''VideoGame/SplinterCellConviction'' [[spoiler: while Sam is interrogating Galliard, a man working for a mysterious group named Megiddo, he learns about Megiddo controlling multiple locations, but before he has a chance to obtain more information, Galliard is assassinated by a shooter to protect Megiddo's identity. The shooter responsible for assassinating him later dies in a car bomb explosion, assumed to be arranged by Megiddo, so the shooter can't reveal Megiddo's identity, [[JackBauerInterrogationTechnique if he is ever caught]] by Fisher.]]

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* In ''VideoGame/SplinterCellConviction'' ''VideoGame/SplinterCell: Conviction'' [[spoiler: while Sam is interrogating Galliard, a man working for a mysterious group named Megiddo, he learns about Megiddo controlling multiple locations, but before he has a chance to obtain more information, Galliard is assassinated by a shooter to protect Megiddo's identity. The shooter responsible for assassinating him later dies in a car bomb explosion, assumed to be arranged by Megiddo, so the shooter can't reveal Megiddo's identity, [[JackBauerInterrogationTechnique if he is ever caught]] by Fisher.]]


** ''VisualNovel/NewDanganRonpaV3'': During the third case, [[spoiler:Angie Yonaga]] is murdered because she walks in on [[spoiler:Korekiyo setting up the trap that would later be used to kill Tenko]].

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** ''VisualNovel/NewDanganRonpaV3'': ''VisualNovel/DanganRonpaV3KillingHarmony'': During the third case, [[spoiler:Angie Yonaga]] is murdered because she walks in on [[spoiler:Korekiyo setting up the trap that would later be used to kill Tenko]].


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* In ''VisualNovel/ShinraiBrokenBeyondDespair'', this is the reason why [[spoiler:Kotoba]] was killed. The mastermind behind the murder plan hadn't necessarily wanted to kill the victim, but needed an additional accomplice, and [[spoiler:Kotoba]] fit the bill, being someone who was easy to manipulate and [[AssholeVictim someone the mastermind didn't mind killing]]. Once the mastermind is almost done with the plan, [[spoiler:Momoko knocks Kotoba out, ties him up and sets the breaker room on fire to create a distraction while she hangs herself. It's possible to save Kotoba, but since he's in no condition to talk, it's up to Raiko to explain what happened]].


A common variant is that the person who purportedly knows too much doesn't actually know anything at all (or at least, doesn't understand what knowledge they have) -- but the overly paranoid conspirators believe that they do, thus leading to their campaign of persecution. There's a good chance the hero will eventually get sick of being relentlessly hounded/threatened/shot at by the conspirators and start fighting back. In the process, they usually learn the "real" secret anyway by constantly coming into contact with said conspirators at every turn and eventually will find a way to bring the plan to ruin. The ironic conclusion, of course, is that if the BigBad [[RevealingCoverup had just relaxed and left the person alone, they'd have succeeded]].

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A common variant is that the person who purportedly knows too much doesn't actually know anything at all (or at least, doesn't understand what knowledge they have) -- ó but the overly paranoid conspirators believe that they do, thus leading to their campaign of persecution. There's a good chance the hero will eventually get sick of being relentlessly hounded/threatened/shot at by the conspirators and start fighting back. In the process, they usually learn the "real" secret anyway by constantly coming into contact with said conspirators at every turn and eventually will find a way to bring the plan to ruin. The ironic conclusion, of course, is that if the BigBad [[RevealingCoverup had just relaxed and left the person alone, they'd have succeeded]].



Another, less sympathetic variation occurs when a character learns a guilty secret possessed by another character and decides it would be a profitable enterprise to {{blackmail}} the second character in exchange for their silence. This one usually overlaps with AssholeVictim, since the second character understandably won't like the idea of being on the hook to a sleazy blackmailer for the rest of their life, [[BlackmailBackfire and is likely to decide that getting rid of the blackmailer will cost them less in the long run than paying up]]. If the blackmail victim's guilty secret is that they are a murderer, this may also add elements of TooDumbToLive to the blackmailer -- after all, someone who's already killed at least one person is unlikely to have many qualms about bumping off someone else, particularly if that someone else is trying to exploit them for money.

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Another, less sympathetic variation occurs when a character learns a guilty secret possessed by another character and decides it would be a profitable enterprise to {{blackmail}} the second character in exchange for their silence. This one usually overlaps with AssholeVictim, since the second character understandably won't like the idea of being on the hook to a sleazy blackmailer for the rest of their life, [[BlackmailBackfire and is likely to decide that getting rid of the blackmailer will cost them less in the long run than paying up]]. If the blackmail victim's guilty secret is that they are a murderer, this may also add elements of TooDumbToLive to the blackmailer -- ó after all, someone who's already killed at least one person is unlikely to have many qualms about bumping off someone else, particularly if that someone else is trying to exploit them for money.









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* Subverted slightly in ''Film/AdventuresInBabysitting'' -- one of the kids had taken a Magazine/{{Playboy}} magazine that could get the crime boss put away, and the presumption the criminals made, of course, was that the kids had read it, plus the fact that they'd met at all meant they knew too much. The magazine was returned, and the crime boss' underling resigned, knocking him out along the way.

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* Subverted slightly in ''Film/AdventuresInBabysitting'' -- ó one of the kids had taken a Magazine/{{Playboy}} magazine that could get the crime boss put away, and the presumption the criminals made, of course, was that the kids had read it, plus the fact that they'd met at all meant they knew too much. The magazine was returned, and the crime boss' underling resigned, knocking him out along the way.



** In "[[Recap/DoctorWhoS3E8TheGunfighters The Gunfighters]]", Johnny Ringo is in Tombstone looking for fellow MagnificentBastard Doc Holliday, and the barkeep recognizes him, and [[TooDumbToLive threatens to go to the Earps]].

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** In "[[Recap/DoctorWhoS3E8TheGunfighters The Gunfighters]]", [[Recap/DoctorWhoS3E8TheGunfighters "The Gunfighters"]]: Johnny Ringo is in Tombstone looking for fellow MagnificentBastard Doc Holliday, and the barkeep recognizes him, and [[TooDumbToLive threatens to go to the Earps]].

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* ''Film/AceVenturaPetDetective'': Lois Einhorn/[[spoiler:Ray Finkle]] murders Roger Podacter when he discovers her true identity during a sexual encounter.
-->'''Ace:''' THAT'S WHY ROGER PODACTER IS DEAD! [[spoiler: ''[[UnsettlingGenderReveal HE FOUND]] [[ICallHimMrHappy CAPTAIN WINKY!]]'']]


* In ''VideoGame/{{Kindergarten}}'', it's possible for the player [[spoiler:and Lily]] to be killed after stumbling upon something you really shouldn't see. [[spoiler:This also is the reason behind Billy's disappearance - he walked in on the janitor disposing of a monster corpse, and was subsequently chosen to be the headmaster's first human guinea pig.]]

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* In ''VideoGame/{{Kindergarten}}'', it's ''VideoGame/{{Kindergarten}}'':
** It's
possible for the player [[spoiler:and Lily]] to be killed after stumbling upon something you really shouldn't see. see.
**
[[spoiler:This also is the reason behind Billy's disappearance - he walked in on the janitor disposing of a monster corpse, and was subsequently chosen to be the headmaster's first human guinea pig.]]


** ''VideoGame/AceCombat7SkiesUnknown'' In the mission ''Faceless Soldier'', Full Band brags to [=AWACS=] Bandog that heís acquired classified information that he intends to reveal once the mission is over. [[spoiler: When the Spare Squadron is ambushed by AI controlled aircraft using spoofed Osean [=IFFs=], Tabloid suggests that they form an element on Trigger, and for Bandog to register anyone not in the formation as an enemy. When they do, Bandog asks for Full Bandís location, and flags him as an enemy, resulting in him getting shot down and killed by Count. When the squadron calls Bandog out on it, Bandog insists that [[MakeItLookLikeAnAccident it was an accident.]]]]

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** ''VideoGame/AceCombat7SkiesUnknown'' ''VideoGame/AceCombat7SkiesUnknown'': In the mission ''Faceless Soldier'', Full Band brags to [=AWACS=] Bandog that heís acquired classified information that he intends to reveal once the mission is over. [[spoiler: When the Spare Squadron is ambushed by AI controlled aircraft using spoofed Osean [=IFFs=], Tabloid suggests that they form an element on Trigger, and for Bandog to register anyone not in the formation as an enemy. When they do, Bandog asks for Full Bandís location, and flags him as an enemy, resulting in him getting shot down and killed by Count. When the squadron calls Bandog out on it, Bandog insists that [[MakeItLookLikeAnAccident it was an accident.]]]]



* In ''VideoGame/CommandAndConquerRedAlert3'' Premier Cherdenko tells [[NonEntityGeneral the Commander]] this to his face right before killing him because [[YouHaveOutlivedYourUsefulness he has outlived his usefulness]]. In this case, the "too much" is that the Soviet Union was on the brink of losing before Cherdenko used TimeTravel to MakeWrongWhatOnceWentRight and, in the process, made himself Premier. In earlier missions, he already killed two of the other people who knew, his right-hand man General Krukov and the time machine's inventor, Dr. Zelinsky.

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* In ''VideoGame/CommandAndConquerRedAlert3'' ''VideoGame/CommandAndConquerRedAlert3'', Premier Cherdenko tells [[NonEntityGeneral the Commander]] this to his face right before killing him because [[YouHaveOutlivedYourUsefulness he has outlived his usefulness]]. In this case, the "too much" is that the Soviet Union was on the brink of losing before Cherdenko used TimeTravel to MakeWrongWhatOnceWentRight and, in the process, made himself Premier. In earlier missions, he already killed two of the other people who knew, his right-hand man General Krukov and the time machine's inventor, Dr. Zelinsky.



* In ''VideoGame/{{Kindergarten}}'', it's possible for the player [[spoiler:and Lily]] to be killed after stumbling upon something you really shouldn't see. [[spoiler:This also is the reason behind Billy's disappearance - he walked in on the janitor disposing of a monster corpse, and was subsequently chosen to be the headmaster's first human guinea pig.]]



* According to the backstory the George Trevor, the architect who helped design the mansion in ''VideoGame/ResidentEvil'', didn't realize that Ozwell Spencer (the founder of [[MegaCorp Umbrella]]) grew paranoid about George. Because George help build a mansion that was filled with traps and secret rooms, he knew everything about the place. Ergo, Spencer wanted him dead so that the secrets would never get out. While George tried to escape the mansion grounds, only to fall into a pit which had a gravestone with his name on it and died anyway due to thirst and starvation.

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* According to the backstory the backstory, George Trevor, the architect who helped design the mansion in ''VideoGame/ResidentEvil'', didn't realize that Ozwell Spencer (the founder of [[MegaCorp Umbrella]]) grew paranoid about George. him. Because George help helped build a mansion that was filled with traps and secret rooms, he knew everything about the place. Ergo, Spencer wanted him dead so that the secrets would never get out. While George tried to escape the mansion grounds, only to fall into a pit pit, which had a gravestone with his name on it it, and died anyway die due to thirst and starvation.



* In ''VideoGame/TheSecretWorld'', this is a regular occurrence: when you finally discover [[TitleDrop The Secret World]], you're either in or you're dead. Between the traditional demon-purging Templars, the control freak Illuminati, the mayhem inducing Dragon, and the mercenary (and non-playable) Phoenicians, you're usually dead by dawn if you run. And these are the GOOD GUYS. Most of the bad guys just leave victims and corpses for you to find. The netural factions are too bogged in their own problems to deal with any of this.
** The recruiter for the Templars outright says that now that your player character knows that the supernatural is real through their own superpowers, they're a target for anima harvesters. You either get syndicated or you go on the hunt-or-be-hunted for the rest of your life. Considering that there are no levels in the game and respawn points require a sponsor, that would mean you're f***ed if you choose the latter.

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* In ''VideoGame/TheSecretWorld'', this ''VideoGame/TheSecretWorld'':
** This
is a regular occurrence: when you finally discover [[TitleDrop The Secret World]], you're either in or you're dead. Between the traditional demon-purging Templars, the control freak Illuminati, the mayhem inducing mayhem-inducing Dragon, and the mercenary (and non-playable) Phoenicians, you're usually dead by dawn if you run. And these are the GOOD GUYS. Most of the bad guys just leave victims and corpses for you to find. The netural factions are too bogged in their own problems to deal with any of this.
**
this.\\\
The recruiter for the Templars outright says that now that your player character knows that the supernatural is real through their own superpowers, they're a target for anima harvesters. You either get syndicated or you go on the hunt-or-be-hunted for the rest of your life. Considering that there are no levels in the game and respawn points require a sponsor, that would mean you're f***ed if you choose the latter.



--> Mihail: Hey, it could be a recipe for lemon pie, for all I know.

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--> Mihail: ---> ''Mihail:'' Hey, it could be a recipe for lemon pie, for all I know.



* ''VideoGame/TheWalkingDead'' Episode 1 [[spoiler: a good reason to not choose Carley to live, especially if playing Lee as a paranoid jerk ass.]]. Episode 2 [[spoiler: Larry in episode 2 also falls into a weird inversion of the trope, as he threatens to tell everyone and he's being the antagonistic jerk ass, while you may play Lee to be a man of a gentle spirit.]]

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* ''VideoGame/TheWalkingDead'' ''VideoGame/TheWalkingDead'':
**
Episode 1 [[spoiler: a 1: This is [[spoiler:a good reason to not choose Carley to live, especially if playing Lee as a paranoid jerk ass.]]. jerkass]].
**
Episode 2 [[spoiler: Larry in episode 2 also 2: [[spoiler:Larry falls into a weird inversion of the trope, as he threatens to tell everyone and he's being the an antagonistic jerk ass, jerkass, while you may play Lee to be as a man of a gentle spirit.]]



* In ''VideoGame/YandereSimulator'', if a student witnesses you committing murder[[note]]And isn't of the Heroic(will try to subdue you and will have to die for you to not lose) or Cowardly(will remain quiet out of fear of you) personas, nor of the Spiteful persona while the murder victim is someone they disliked.[[/note]], but you manage to get away with it, they will constantly talk about it to other students, which will constantly dip your reputation. The solution? LeaveNoWitnesses.

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* In ''VideoGame/YandereSimulator'', if a student witnesses you committing murder[[note]]And isn't of the Heroic(will Heroic (will try to subdue you and will have to die for you to not lose) or Cowardly(will Cowardly (will remain quiet out of fear of you) personas, nor of the Spiteful persona while if the murder victim is someone they disliked.[[/note]], but you manage to get away with it, they will constantly talk about it to other students, which will constantly dip your reputation. The solution? LeaveNoWitnesses.

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* In episode 15 of ''Anime/TenchiUniverse'', a Juraian agent orders the Galaxy Police to capture Mihoshi and Kiyone after Mihoshi was listening to a conversation between the agent and the Galaxy Police chief, revealing that the GP had conspired with Jurai in order to capture Ayeka.


* Nicodemus inverts this in a discussion with Mrs. Frisby in ''WesternAnimation/TheSecretOfNimh''; instead of using it as an excuse to die, he utilizes this fact as a reason to survive by leaving their colony. "My child, we can no longer live as rats... we ''know'' too much." In this case, the rats have become so intelligent that they've developed morals against stealing from the local farmer to survive, and must form their own civilization away from humans.
* The true BigBad of ''WesternAnimation/MonstersInc'', [[spoiler:Mr. Waternoose]], says this, and unfortunately for him, [[EngineeredPublicConfession Mike gets it on tape]].
* Fred in ''Disney/BigHero6'' cites this trope as the reason why Yokai is trying to kill them, after the heroes see him and his nanobots.



* Fred in ''Disney/BigHero6'' cites this trope as the reason why Yokai is trying to kill them, after the heroes see him and his nanobots.
* The true BigBad of ''WesternAnimation/MonstersInc'', [[spoiler:Mr. Waternoose]], says this, and unfortunately for him, [[EngineeredPublicConfession Mike gets it on tape]].
* Nicodemus inverts this in a discussion with Mrs. Frisby in ''WesternAnimation/TheSecretOfNimh''; instead of using it as an excuse to die, he utilizes this fact as a reason to survive by leaving their colony. "My child, we can no longer live as rats... we ''know'' too much." In this case, the rats have become so intelligent that they've developed morals against stealing from the local farmer to survive, and must form their own civilization away from humans.



* Creator/AlfredHitchcock was fond of this trope, which he used as the key plot element in films such as ''[[ExactlyWhatItSaysOnTheTin The Man Who Knew Too Much]]'', ''Film/NorthByNorthwest'', and ''Film/{{Saboteur}}''.
* The main action of the Brandon Lee movie ''Film/RapidFire'' starts when Brandon's character witnesses a bad guy in the act of taking out a rival.
* ''Film/BackToTheFuturePartII'': Old Biff gets the idea to back to the past to give his 1955 self [[TimelineAlteringMacGuffin the Gray's Sports Almanac]], so he'll be rich in the future. He also tells him that either a kid (Marty) or an old man (Doc) will come around asking about that book, and to kill them if they do so. Indeed, Present Biff-A tries to shoot Marty down in his own office after he finishes his exposition, and Marty barely escapes with his life.
* In a movie about the presidential candidate Luis Donaldo Colosio's assassination in Tijuana called ''Colosio: El Asesinato'', the main character is a police officer who works undercover and is asked by the president's former brother-in-law José Francisco Ruiz Massieu to investigate the murder. After a series of investigations, he concludes that the very same party killed Colosio. At the same time, someone is killing everyone involved with the case and murder, including the murderer and anyone who dares to seek the truth. As a result, the main character gets killed in the end as well as his pregnant wife, his partner, the police chief in Tijuana, and Ruiz Massieu, all because of this trope.
* ''Film/SnakesOnAPlane'': The catalytic event for the eponymous serpents upon the aircraft.



* The Hong Kong action movie ''Sha Po Lang'' (known in the US as "Killzone") kicks off with the murder of a witness ordered by a Triad crimelord so that his testimony could not be given and the crimelord would be set free. This sets four cops against him, all with their own reasons for wanting to take him down.
* In ''Film/LethalWeapon'', Riggs is tortured by the bad guys to find out what he knows about their impending shipment, which is [[spoiler:nothing]].
* In ''Film/{{Serenity}}'', the Operative is sent after River because she picked up the secret of Miranda, which has been buried for twelve years, from the heads of top members of the Alliance's Parliament who came to the Academy to see her. The nature of the secret in question means that Parliament wants more than anything to keep it buried, even if it means River must die.
** This is a perfect example of the variant, since River was totally crazy, so she couldn't have communicated what she knew to anybody who could do anything about it. The Operative coming after her and the crew compelled them to find out the truth.
* ''Film/TheManWithOneRedShoe'' (the American remake of the French ''Film/TheTallBlondManWithOneBlackShoe'') has the scheming deputy head of the CIA trying to frame the actual head, so that he can have his job. The head knows this, and lets slip that someone who can foil this plan very simply will be arriving at the airport. He then sends his aide to meet any random person at the airport, so that the deputy and his men will follow them and try to find out what he knows. The aide picks a rather head-in-the-clouds musician, who's wearing a pair of mismatched shoes because of a practical joke.
* TheHero in ''Film/MarathonMan'' is one of the actually-know-nothing kind.
* [[spoiler:Governor Swann]] is [[YouHaveOutlivedYourUsefulness killed]] in ''Film/PiratesOfTheCaribbeanAtWorldsEnd'' because he finds out what ''really'' happens when someone stabs Davy Jones' heart.
* It's pretty strongly implied that the "villain" of ''Film/TheHunted2003'' was just acting in self defense, pursued by government assassins over his past black-ops experience.
* [[spoiler:Robert]]'s justification for killing Leroy and Destiny in ''Film/MysteryTeam''.
* In ''Film/CaptainAmericaTheFirstAvenger'', Col Phillips warns a captured Zola that Schmitt will see him this way.
** In the sequel, a maid walks in on her employer briefing the Winter Soldier, and is [[EvenEvilHasStandards regretfully]] shot dead.
* In ''Film/{{Drive}}'', a gangster uses a crew of low level criminals to rip off a Mafia boss with the intent to later kill them and take the money for himself. When the plan blows up in his face, he and his partner decide that everyone involved Knows Too Much and must die so the Mafia never finds out who was really responsible. Ironically, the only survivor of the crew actually does not know anything and was about to leave town.
* [[spoiler:Mushnik]] in ''Film/LittleShopOfHorrors'', adapted from [[Theatre/LittleShopOfHorrors the stage musical]]. This trope did ''[[DeathByAdaptation not]]'' apply to [[Film/TheLittleShopOfHorrors the original film]].
* Inverted in ''Film/DiamondsAreForever'' concerning the diamond smuggling ring. When one of your own passes you fake diamonds, he knows too much about the circumstances to die. This is demonstrated when Shady Tree rescues James Bond (who had assumed the identity of Peter Franks, a fellow diamond smuggler who Bond had killed) from a retort to question him about where he hid the real diamonds, only for Bond to use leverage against him to the tune of $50,000 ("You bring me the real money, and I'll bring you the real diamonds."), and then {{Zig Zagged|Trope}} when Albert R. Saxby reminds Wint and Kidd that they "didn't get the real diamonds. So we need Tree, alive." Wint and Kidd remark on how "that's most annoying" because they had already cut Tree down, as revealed when Bond shows up in his dressing room.
* All over the place in ''Film/TheFourthProtocol'', about a Soviet plot to set off a nuclear bomb outside a US airbase in Britain and MakeItLookLikeAnAccident. The implications of this plan being exposed are so serious that the KGB sleeper agent and the scientist who assembles the bomb are [[PleaseShootTheMessenger set up to be killed]]. The film takes this up to another level for dramatic purposes -- it opens with traitor Kim Philby (who planned the operation) being shot, the man who shot Philby getting his neck broken, and an innocent bystander who walks in on an exchange of a smuggled component gets stabbed.



* ''Film/StarTrekVITheUndiscoveredCountry'': The two crewmen who killed the Klingon Chancellor are killed in turn by [[spoiler:another conspirator, Lt. Valeris]]. On finding the bodies, Kirk grimly notes "First rule of assassination: Kill the assassins."

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* ''Film/StarTrekVITheUndiscoveredCountry'': The two crewmen ''Film/{{Andhadhun}}'':
** Mrs. D'Sa having seen
who entered the Sinhas' apartment and in which order makes her able to contradict Simi's account of the events. In addition, she says that she would be able to identify the unknown man who entered first (Manohar), which would reveal the truth. Consequently, Simi decides to kill her before she can go on record.
** Akash knowing about the murder of Mrs. D'Sa. Simi decides to ruin his credibility as a witness by blinding him for real. Manohar decides that that isn't enough, and goes to kill him instead.
* ''Film/BackToTheFuturePartII'': Old Biff gets the idea to back to the past to give his 1955 self [[TimelineAlteringMacGuffin the Gray's Sports Almanac]], so he'll be rich in the future. He also tells him that either a kid (Marty) or an old man (Doc) will come around asking about that book, and to kill them if they do so. Indeed, Present Biff-A tries to shoot Marty down in his own office after he finishes his exposition, and Marty barely escapes with his life.
* In ''Film/BreakheartPass'', Capt. Oakland, Lt. Newell and the fireman are all murdered because they discover too much about the conspiracy and what is really going on at the fort.
* In ''Film/CaptainAmericaTheFirstAvenger'', Col Phillips warns a captured Zola that Schmitt will see him this way.
* In ''Film/CaptainAmericaTheWinterSoldier'', a maid walks in on her employer briefing the Winter Soldier, and is [[EvenEvilHasStandards regretfully]] shot dead.
* In a movie about the presidential candidate Luis Donaldo Colosio's assassination in Tijuana called ''Colosio: El Asesinato'', the main character is a police officer who works undercover and is asked by the president's former brother-in-law José Francisco Ruiz Massieu to investigate the murder. After a series of investigations, he concludes that the very same party
killed Colosio. At the Klingon Chancellor are same time, someone is killing everyone involved with the case and murder, including the murderer and anyone who dares to seek the truth. As a result, the main character gets killed in turn by [[spoiler:another conspirator, Lt. Valeris]]. On finding the bodies, Kirk grimly notes "First rule of assassination: Kill end as well as his pregnant wife, his partner, the assassins."police chief in Tijuana, and Ruiz Massieu, all because of this trope.
* ''Film/TheConspiracy'' kicks off when the subject of a conspiracy theorist documentary goes missing, [[spoiler:and Jim is killed and Aaron threatened into silence after being found out at the Tarsus Club]].



* In ''Film/TeenageMutantNinjaTurtles1990'', Shredder orders his Foot Clan to kill April O'Neil when she begins to dig too deep into his group.
* ''Film/TheConspiracy'' kicks off when the subject of a conspiracy theorist documentary goes missing, [[spoiler:and Jim is killed and Aaron threatened into silence after being found out at the Tarsus Club]].
* ''Film/ThePresidentsAnalyst'' is privy to the innermost thoughts of the President - when the strain of the job becomes too much he [[{{ScrewThisImOuttaHere}} skips town]], pursued by foreign agents wanting to tap his mind, and domestic agents who, because he knows too much, want to bring him in or kill him.

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* In ''Film/TeenageMutantNinjaTurtles1990'', Shredder orders his Foot Clan to kill April O'Neil when she begins to dig too deep into his group.
* ''Film/TheConspiracy'' kicks off when
Inverted in ''Film/DiamondsAreForever'' concerning the subject diamond smuggling ring. When one of a conspiracy theorist documentary goes missing, [[spoiler:and Jim is killed and Aaron threatened into silence after being found out at the Tarsus Club]].
* ''Film/ThePresidentsAnalyst'' is privy to the innermost thoughts of the President - when the strain of the job becomes too much he [[{{ScrewThisImOuttaHere}} skips town]], pursued by foreign agents wanting to tap his mind, and domestic agents who, because
your own passes you fake diamonds, he knows too much, want much about the circumstances to die. This is demonstrated when Shady Tree rescues James Bond (who had assumed the identity of Peter Franks, a fellow diamond smuggler who Bond had killed) from a retort to question him about where he hid the real diamonds, only for Bond to use leverage against him to the tune of $50,000 ("You bring him me the real money, and I'll bring you the real diamonds."), and then {{Zig Zagged|Trope}} when Albert R. Saxby reminds Wint and Kidd that they "didn't get the real diamonds. So we need Tree, alive." Wint and Kidd remark on how "that's most annoying" because they had already cut Tree down, as revealed when Bond shows up in or his dressing room.
* In ''Film/{{Drive}}'', a gangster uses a crew of low level criminals to rip off a Mafia boss with the intent to later
kill him.them and take the money for himself. When the plan blows up in his face, he and his partner decide that everyone involved Knows Too Much and must die so the Mafia never finds out who was really responsible. Ironically, the only survivor of the crew actually does not know anything and was about to leave town.
* All over the place in ''Film/TheFourthProtocol'', about a Soviet plot to set off a nuclear bomb outside a US airbase in Britain and MakeItLookLikeAnAccident. The implications of this plan being exposed are so serious that the KGB sleeper agent and the scientist who assembles the bomb are [[PleaseShootTheMessenger set up to be killed]]. The film takes this up to another level for dramatic purposes -- it opens with traitor Kim Philby (who planned the operation) being shot, the man who shot Philby getting his neck broken, and an innocent bystander who walks in on an exchange of a smuggled component gets stabbed.
* In ''Film/Frankenstein1970'', Victor murders his old family retainer Schutter after Schutter discovers his secret laboratory.
* Creator/AlfredHitchcock was fond of this trope, which he used as the key plot element in films such as ''[[ExactlyWhatItSaysOnTheTin The Man Who Knew Too Much]]'', ''Film/NorthByNorthwest'', and ''Film/{{Saboteur}}''.
* After Rick shows his girlfriend Angela Bancroft's secret museum in ''Film/HorrorsOfTheBlackMuseum'', Bancroft decides that Angela knows too much and hypnotizes Rick into murdering her.
* It's pretty strongly implied that the "villain" of ''Film/TheHunted2003'' was just acting in self defense, pursued by government assassins over his past black-ops experience.



* Averted in ''Film/TheThirdMan''. After Harry Lime makes an ImpliedDeathThreat during his motive speech in the ferris wheel, Holly Martins tells him that the authorities already know that he's NotQuiteDead, so killing Holly wouldn't change anything.
* ''Film/SharkAttack'': It turns out that Steven's friend was murdered and [[FedToTheBeast dumped into a shark-infested lake]] because he was starting to uncover the bad guy's plan.
* ''Film/{{RED}}'' starts when a commando team tries to assassinate retired CIA agent Frank Moses. He quickly realizes that someone is trying to kill him because of something he knows, but because he doesn't know what it is and they don't know who he might have told, they're targeting people he's been in contact with as well so he's got to find his old friends before they can be attacked as well.



* ''Film/MulhollandFalls'': Alison was murdered because she had uncovered and recorded illegal nuclear testing on U.S. military personel at the atomic testing site.
* ''Film/WomanOnTheRun'': The whole plot of the film is Eleanor trying to find Frank who has run away from a mobster who knows he witnessed his murder of an informant. And the killer stops at nothing to find him.
* In ''Film/BreakheartPass'', Capt. Oakland, Lt. Newell and the fireman are all murdered because they discover too much about the conspiracy and what is really going on at the fort.

to:

* ''Film/MulhollandFalls'': Alison was murdered because she had uncovered and recorded illegal nuclear testing on U.S. military personel at In ''Film/LethalWeapon'', Riggs is tortured by the atomic testing site.
bad guys to find out what he knows about their impending shipment, which is [[spoiler:nothing]].
* ''Film/WomanOnTheRun'': The whole plot [[spoiler:Mushnik]] in ''Film/LittleShopOfHorrors'', adapted from [[Theatre/LittleShopOfHorrors the stage musical]]. This trope did ''[[DeathByAdaptation not]]'' apply to [[Film/TheLittleShopOfHorrors the original film]].
* ''Film/TheManWithOneRedShoe'' (the American remake
of the film is Eleanor French ''Film/TheTallBlondManWithOneBlackShoe'') has the scheming deputy head of the CIA trying to find Frank who has run away from a mobster who frame the actual head, so that he can have his job. The head knows he witnessed this, and lets slip that someone who can foil this plan very simply will be arriving at the airport. He then sends his murder of an informant. And aide to meet any random person at the killer stops at nothing airport, so that the deputy and his men will follow them and try to find him.
* In ''Film/BreakheartPass'', Capt. Oakland, Lt. Newell and the fireman are all murdered
out what he knows. The aide picks a rather head-in-the-clouds musician, who's wearing a pair of mismatched shoes because they discover too much about of a practical joke.
* TheHero in ''Film/MarathonMan'' is one of
the conspiracy and what is really going on at the fort.actually-know-nothing kind.



* In ''Film/TragedyGirls'', [[spoiler:when Jordan ''finally'' catches wise to Sadie's true nature, she hangs him. Though, considering how the film ends with Sadie and [=McKayla=] massacring the entire prom, he was probably screwed either way]].
* In ''Film/Frankenstein1970'', Victor murders his old family retainer Schutter after Schutter discovers his secret laboratory.
* In ''Film/OnceUponATimeInMexico'', Sands is captured after he discovers part of Barillo's plan that he wasn't supposed to. It ends badly for him, though not fatally.
-->'''Sands''': I feel its only fair to warn you that killing me is crossing the line and you will have every single Marine from here to Guantanamo Bay up your keester, mister, so just know that.\\
'''Barillo''': Fortunately for you, nothing you did is worth dying for. You have only seen too much. [[EyeScream We are going to make sure this does not happen again]].



* ''Film/{{Andhadhun}}'':
** Mrs. D'Sa having seen who entered the Sinhas' apartment and in which order makes her able to contradict Simi's account of the events. In addition, she says that she would be able to identify the unknown man who entered first (Manohar), which would reveal the truth. Consequently, Simi decides to kill her before she can go on record.
** Akash knowing about the murder of Mrs. D'Sa. Simi decides to ruin his credibility as a witness by blinding him for real. Manohar decides that that isn't enough, and goes to kill him instead.
* After Rick shows his girlfriend Angela Bancroft's secret museum in ''Film/HorrorsOfTheBlackMuseum'', Bancroft decides that Angela knows too much and hypnotizes Rick into murdering her.

to:

* ''Film/{{Andhadhun}}'':
** Mrs. D'Sa having
''Film/MulhollandFalls'': Alison was murdered because she had uncovered and recorded illegal nuclear testing on U.S. military personnel at the atomic testing site.
* [[spoiler:Robert]]'s justification for killing Leroy and Destiny in ''Film/MysteryTeam''.
* In ''Film/OnceUponATimeInMexico'', Sands is captured after he discovers part of Barillo's plan that he wasn't supposed to. It ends badly for him, though not fatally.
-->'''Sands''': I feel its only fair to warn you that killing me is crossing the line and you will have every single Marine from here to Guantanamo Bay up your keester, mister, so just know that.\\
'''Barillo''': Fortunately for you, nothing you did is worth dying for. You have only
seen who entered too much. [[EyeScream We are going to make sure this does not happen again]].
* In ''Film/ThePhenixCityStory'',
the Sinhas' apartment and in which order makes her able to contradict Simi's account of the events. In addition, she says that she would be able to identify the unknown man who entered first (Manohar), which would reveal the truth. Consequently, Simi decides gangsters set out to kill her Ellie, the sole witness to the assassination of Patterson.
* [[spoiler:Governor Swann]] is [[YouHaveOutlivedYourUsefulness killed]] in ''Film/PiratesOfTheCaribbeanAtWorldsEnd'' because he finds out what ''really'' happens when someone stabs Davy Jones' heart.
* ''Film/ThePresidentsAnalyst'' is privy to the innermost thoughts of the President - when the strain of the job becomes too much he [[{{ScrewThisImOuttaHere}} skips town]], pursued by foreign agents wanting to tap his mind, and domestic agents who, because he knows too much, want to bring him in or kill him.
* The main action of the Brandon Lee movie ''Film/RapidFire'' starts when Brandon's character witnesses a bad guy in the act of taking out a rival.
* ''Film/{{RED}}'' starts when a commando team tries to assassinate retired CIA agent Frank Moses. He quickly realizes that someone is trying to kill him because of something he knows, but because he doesn't know what it is and they don't know who he might have told, they're targeting people he's been in contact with as well so he's got to find his old friends
before they can be attacked as well.
* In ''Film/{{Serenity}}'', the Operative is sent after River because
she can go on record.
picked up the secret of Miranda, which has been buried for twelve years, from the heads of top members of the Alliance's Parliament who came to the Academy to see her. The nature of the secret in question means that Parliament wants more than anything to keep it buried, even if it means River must die.
** Akash knowing This is a perfect example of the variant, since River was totally crazy, so she couldn't have communicated what she knew to anybody who could do anything about it. The Operative coming after her and the crew compelled them to find out the truth.
* The Hong Kong action movie ''Sha Po Lang'' (known in the US as "Killzone") kicks off with
the murder of Mrs. D'Sa. Simi decides to ruin his credibility as a witness ordered by blinding him for real. Manohar decides a Triad crimelord so that his testimony could not be given and the crimelord would be set free. This sets four cops against him, all with their own reasons for wanting to take him down.
* ''Film/SharkAttack'': It turns out
that isn't enough, Steven's friend was murdered and goes to kill him instead.
* After Rick shows his girlfriend Angela Bancroft's secret museum in ''Film/HorrorsOfTheBlackMuseum'', Bancroft decides that Angela knows too much and hypnotizes Rick
[[FedToTheBeast dumped into murdering her.a shark-infested lake]] because he was starting to uncover the bad guy's plan.
* ''Film/SnakesOnAPlane'': The catalytic event for the eponymous serpents upon the aircraft.


Added DiffLines:

* ''Film/StarTrekVITheUndiscoveredCountry'': The two crewmen who killed the Klingon Chancellor are killed in turn by [[spoiler:another conspirator, Lt. Valeris]]. On finding the bodies, Kirk grimly notes "First rule of assassination: Kill the assassins."
* In ''Film/TeenageMutantNinjaTurtles1990'', Shredder orders his Foot Clan to kill April O'Neil when she begins to dig too deep into his group.
* Averted in ''Film/TheThirdMan''. After Harry Lime makes an ImpliedDeathThreat during his motive speech in the ferris wheel, Holly Martins tells him that the authorities already know that he's NotQuiteDead, so killing Holly wouldn't change anything.
* In ''Film/TragedyGirls'', [[spoiler:when Jordan ''finally'' catches wise to Sadie's true nature, she hangs him. Though, considering how the film ends with Sadie and [=McKayla=] massacring the entire prom, he was probably screwed either way]].
* ''Film/WomanOnTheRun'': The whole plot of the film is Eleanor trying to find Frank who has run away from a mobster who knows he witnessed his murder of an informant. And the killer stops at nothing to find him.

Added DiffLines:

* ''Literature/{{Flawed}}'': After Craven gives Celestine a sixth brand, he does whatever he can to cover it up. Any staff that saw it mysteriously cannot be reached, while Carrick is forced into hiding.


** Two thirds of the way through ''VideoGame/AceCombat5TheUnsungWar'', [[spoiler: the Wardog Squadron discovers that the war between Osea and Yuktobonia was instigated by an organization called the Grey Men, to avenge their homeland of Belka. While they succeed in getting the Wardog Squadron branded as traitors, they fail to eliminate them, and the Wardog Squadron goes on to stop the Grey Men from escalating the war any further.]]

to:

** Two thirds of the way through ''VideoGame/AceCombat5TheUnsungWar'', [[spoiler: the Wardog Squadron discovers that the war between Osea and Yuktobonia was instigated by an organization called the Grey Men, to avenge their homeland of Belka. Belka, after the Grey Men try and fail to wipe them out while returning from a mission. As a result, the Grey Men resort to Plan B: Frame Wardog as traitors and get them executed by their own countrymen. While they succeed in getting the Wardog Squadron branded as traitors, they fail to eliminate them, get them eliminated, and the Wardog Squadron goes on to stop the Grey Men from escalating the war any further.]]


*** In the OmegaEnding, [[spoiler: this is one possible reason for why Simon Orestes Cohen purged[[PlayerCharacter Nemo]] in the simulation once all possibilities were run through the program, as he couldnít risk the possibility of Nemo alerting the [=UPEO=], General Resource, Neucom, or even Dision of his treachery. However, Simon then turns right around and releases a copy of Nemo into the real world, with the intent to engineer events so the Inter-Corporate War occurs in reality. As it turns out, he too was close to Yoko, and blamed ''Dision'' for her death; the entire purpose of the Inter-Corporate War simulation was to ensure that no matter the outcome, Nemo ''would'' kill Dision.]]

to:

*** In the OmegaEnding, [[spoiler: this is one possible reason for why Simon Orestes Cohen purged[[PlayerCharacter purged [[PlayerCharacter Nemo]] in the simulation once all possibilities were run through the program, as he couldnít risk the possibility of Nemo alerting the [=UPEO=], General Resource, Neucom, or even Dision of his treachery. However, Simon then turns right around and releases a copy of Nemo into the real world, with the intent to engineer events so the Inter-Corporate War occurs in reality. As it turns out, he too was close to Yoko, and blamed ''Dision'' for her death; the entire purpose of the Inter-Corporate War simulation was to ensure that no matter the outcome, Nemo ''would'' kill Dision. For the plan to work, however, Nemo had to function on its own, without knowledge of how the Inter-Corporate War would come to pass, so the copy released by Cohen was a ''clean'' one.]]


*** In the OmegaEnding, [[spoiler: this is one possible reason for why Simon Orestes Cohen purged the [[PlayerCharacter Nemo]] in the simulation once all possibilities were run through the program, as he couldnít risk the possibility of Nemo alerting the [=UPEO=], General Resource, Neucom, or even Dision of his treachery.]]

to:

*** In the OmegaEnding, [[spoiler: this is one possible reason for why Simon Orestes Cohen purged the [[PlayerCharacter purged[[PlayerCharacter Nemo]] in the simulation once all possibilities were run through the program, as he couldnít risk the possibility of Nemo alerting the [=UPEO=], General Resource, Neucom, or even Dision of his treachery.treachery. However, Simon then turns right around and releases a copy of Nemo into the real world, with the intent to engineer events so the Inter-Corporate War occurs in reality. As it turns out, he too was close to Yoko, and blamed ''Dision'' for her death; the entire purpose of the Inter-Corporate War simulation was to ensure that no matter the outcome, Nemo ''would'' kill Dision.]]


** In the mission ''Faceless Soldier'', Full Band brags to [=AWACS=] Bandog that heís acquired classified information that he intends to reveal once the mission is over. [[spoiler: When the Spare Squadron is ambushed by AI controlled aircraft using spoofed Osean [=IFFs=], Tabloid suggests that they form an element on Trigger, and for Bandog to register anyone not in the formation as an enemy. When they do, Bandog asks for Full Bandís location, and flags him as an enemy, resulting in him getting shot down and killed by Count. When the squadron calls Bandog out on it, Bandog insists that [[MakeItLookLikeAnAccident it was an accident.]]]]

to:

** ''VideoGame/AceCombat7SkiesUnknown'' In the mission ''Faceless Soldier'', Full Band brags to [=AWACS=] Bandog that heís acquired classified information that he intends to reveal once the mission is over. [[spoiler: When the Spare Squadron is ambushed by AI controlled aircraft using spoofed Osean [=IFFs=], Tabloid suggests that they form an element on Trigger, and for Bandog to register anyone not in the formation as an enemy. When they do, Bandog asks for Full Bandís location, and flags him as an enemy, resulting in him getting shot down and killed by Count. When the squadron calls Bandog out on it, Bandog insists that [[MakeItLookLikeAnAccident it was an accident.]]]]

Added DiffLines:

** In the mission ''Faceless Soldier'', Full Band brags to [=AWACS=] Bandog that heís acquired classified information that he intends to reveal once the mission is over. [[spoiler: When the Spare Squadron is ambushed by AI controlled aircraft using spoofed Osean [=IFFs=], Tabloid suggests that they form an element on Trigger, and for Bandog to register anyone not in the formation as an enemy. When they do, Bandog asks for Full Bandís location, and flags him as an enemy, resulting in him getting shot down and killed by Count. When the squadron calls Bandog out on it, Bandog insists that [[MakeItLookLikeAnAccident it was an accident.]]]]

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