History Main / HeKnowsTooMuch

* ''WesternAnimation/MonstersInc'': [[spoiler:Mr. Waternoose]] says this as his reasoning for still going after Boo in the film's climax, and unfortunately for him, [[EngineeredPublicConfession Mike gets it on tape]].

* ''WesternAnimation/TreasurePlanet'': [[spoiler:After Captain Flint [[EarthShatteringKaboom rigged Treasure Planet to explode]] if anyone reached the planet's core, where he kept all of his treasure, he removed B.E.N.'s memory unit then held on to it after he died, prevent B.E.N. from telling anyone else until it was too late.]]

* ''Film/TheShawshankRedemption'': [[spoiler:[[BigBad Warden Samuel Norton]] orders the murder of inmate Tommy Williams due to his knowledge of who actually killed Andy Dufresne's wife and lover.]]

* ''WesternAnimation/TreasurePlanet'': [[spoler:After Captain Flint [[EarthShatteringKaboom rigged Treasure Planet to explode]] if anyone reached the planet's core, where he kept all of his treasure, he removed B.E.N.'s memory unit then held on to it after he died, prevent B.E.N. from telling anyone else until it was too late.]]

* ''Film/TheShawshankRedemption'': [[BigBad Warden Samuel Norton]] orders the murder of inmate Tommy Williams due to his knowledge of who actually killed Andy Dufresne's wife and lover.

** In the first game, Mia was murdered because she had pieced together Redd White's blackmailing schemes.
** ''Justice for All'':

** In ''Trials and Tribulations'', this is a favorite reason of [[spoiler:Dahlia Hawthorne's]], for committing murder. [[spoiler:She kills Doug Swallow because he figured out that she stole poison from the pharmaceutical labs and was trying to tell Phoenix, and it was also revealed that she'd been on her way to poison Phoenix because he unwittingly had the only piece of evidence that could implicate her in another crime]]. Earlier, [[spoiler:she arranged for the death of her half-sister to prevent said sister from confessing to a crime they committed and also talks her boyfriend into a suicide pact so he'd kill himself before Mia Fey could get him to implicate Dahlia]]. Finally, [[spoiler:she poisoned Diego Armando when he got too close to proving her guilt over the death of her half-sister.]]

** This ''almost'' happened in the backstory to the second case, but the intended victim escaped and turned the tables. [[spoiler: Pal Meraktis and Alita Tiala were the only people who knew that Wocky Kitalki had bullet near his heart and probably not long to live- Pal because he was the doctor who failed to take it out, and Alita because she was the attending nurse. They both kept quiet about it; Pal Meraktis didn't want to lose the Kitalkis' custom and Alita decided to [[GoldDigger marry Wocky so she could inherit his money when he died.]] Due to circumstances, Meraktis thought that Alita would tell Wocky about his condition, and tried to kill her so she couldn't. However, he failed to kill her by suffocation and she instead woke up and shot him.]]
** The reason Drew Misham was murdered (and his daughter nearly killed) was because he was a forger who might have revealed the identity of his client [[spoiler: Kristoph Gavin]], who was so paranoid he tried to kill everyone connected to that case.

** ''[[VisualNovel/PhoenixWrightAceAttorneyDualDestinies Dual Destinies]]'':

** The first culprit of ''[[VisualNovel/PhoenixWrightAceAttorneySpiritOfJustice Spirit of Justice]]'' murders Paht Rohl because he knew [[spoiler:that the Founder's Orb had been stolen. That would throw suspicion on the culprit, the person who would have the easiest time stealing the thing (a proper suspicion, because the culprit did steal it)]].

* Played with in ''[[https://www.fanfiction.net/s/12574905/1/In-the-Kingdom-s-Service In the Kingdom's Service]]''. Blake fears that her knowing Jaune and Oobleck are in the Vale Secret Service might get her killed, though Jaune refuses to snitch on her and Oobleck reveals [[spoiler:as he dies]] that he'd known for weeks. After [[spoiler:Jaune resigns from VSS over their order to doom himself and his team to save Vale]], he's slated for termination but it's later explained that the problem isn't what he knows[[note]]By the time he leaves, the only agents Jaune knows the identities of are dead and his only other information is a couple safe houses, a code name or two, and that Ozpin and Cinder fall are being investigated[[/note]], but that he's got connections to both Ozpin and Cinder, neither of whom can be allowed to learn of the VSS and their actions.

* In ''Fanfic/WinterWar'', [[spoiler:Hisagi]] kills Iemura for discovering that [[spoiler:he is a FakeDefector]], even though they were (theoretically) on the same side and Iemura was offering his support because he didn't believe that Iemura could keep the secret. The guilt eventually drives the killer into HeroicBSOD to the point where his [[EmpathicWeapon zanpakutou]] has to take over his body just to keep him alive.
* In ''Fanfic/ToHellAndBackArrowverse'', the main tree characters were forced into working for the League of Assassins for several years before breaking free. They have kept their past actions from their families, but Amanda Waller knows everything about them. As Oliver Queen succinctly puts, "[She knows] too much". Unfortunately for them, Waller has made herself untouchable.
* ''Fanfic/KaraOfRokyn'': After Lex Luthor shows to them what he has done to Superman, villains Cyber and Starfire realize Luthor will kill them if he believes they might reveal his secret.
* In ''[[https://www.fanfiction.net/s/4734952/10/Promise-on-the-Festival-Night Promise on the Festival Night]]'', [[Manga/ElfenLied Kouta's]] father heavily suspects that Lucy has committed several crimes, such as fraud and murder (which she has). Kouta's father threatens to tell Kouta (as well as Child Services and the Police) about his suspicions unless Lucy stays away from his son. To be able to stay with Kouta without him finding out what kind of person she is, [[{{Yandere}} Lucy]] murders Kouta's father by pushing him in front of an oncoming train.
* ''[[https://archiveofourown.org/works/25596283/chapters/62123425 Safe Harbor]]'' has a non-lethal variant when King Frederic orders his guards to keep Varian contained so as to prevent him from revealing to everyone how much danger the black rocks pose to the kingdom.
* ''FanFic/RemnantsBizarreAdventure'': While most of [[TheManBehindTheMan Cinder]]'s Stand users only know Torchwick, and if they have met her it was while she was in disguise, Red Hot Chili Pepper is an exception due to being tasked with spying on Ozpin, Ironwood, and Jotaro through Beacon's CCTV systems and having to report to her. As soon as Josuke beats him at the docks, Cinder torches Akira Otoishi before RHCP can reveal her name. She mentions to Roman beforehand that Otoishi is simply a PsychoForHire who was planning to move on after that job, and she would have killed him even if he had succeeded in his mission.
* ''Webcomic/ScoobAndShag'': After he delivers his report to him, [[spoiler:Mick kills Patrick to make sure that he can't tell anyone else about what happens in the future]].
* ''Fanfic/ForTheGloryOfIrk'': As we learn near the end of the story, [[spoiler: [[BigBadDuumvirate the Control Brains]] assassinated Tallest Miyuki when she learned of [[TheConspiracy their plans]], and [[FrameUp made it look like an accident caused by Zim]]]].
* In ''Fanfic/TheAwakeningOfAMagus'' when [[spoiler:Pettigrew is captured in a manner that doesn't allow Voldemort to drain his power, he orders him to be killed while in custody]].
* ''FanFic/InWithTheOldOutWithTheNew'' has Kano kidnapping Cassie Cage mainly because she discovered the new location of the Black Dragon hideout, but also as payback for Sonya beating him down back in the refugee camp.
* Played with in ''Fanfic/MisalignedGemini'' when Prowl fears that Sideswipe may be targeted for learning that he was the subject of another of Sentinel Prime's governmental cover ups. Sentinel's final orders being to kill Starscream, his own former Head of Intelligence, only makes Prowl more worried for Sideswipe's safety and he tries to convince Sideswipe not to come to work the next day. [[spoiler:Later, Sideswipe realizes that Getaway, a Spec Ops bot and one of Sentinel's top men, would have hunted down and killed him for knowing about the conspiracy if Sideswipe did not gain Getaway's curiosity by trying to establish contact with loyal Autobots in Kaon.]]

* ''Fanfic/ThrowAwayYourMask'': It's implied that [[spoiler: Adachi]] was the person who kidnapped Akechi and threw him into the Midnight Channel shortly after Kanji was rescued, because Akechi correctly guessed that [[spoiler: Adachi]] was the murderer and hoped to get rid of him.

** When Erwin Smith was young, his father had a theory that the Goverment must have brainwashed to populace within the Walls to hide the truth about the Titans and the world beyond the Walls. [[spoiler:The Military Police eventually found out about this and tortured his father to death]].

* ''Series/MidsomerMurders'': In "[[Recap/MidsomerMurdersS1E0 The Killings at Badger's Drift]] ", Emily is murdered because she sees siblings Michael and Katherine Lacey having sex.

* Joked about in ''WesternAnimation/AvatarTheLastAirbender'' when Aang and [[spoiler:a post-HeelFaceTurn Zuko]] discover that the ancient [[{{Mayincatec}} Sun Warriors]], thought long extinct, are actually still extant and just living in seclusion. The Sun Chief declares that because they have learned this secret, they know too much and cannot be allowed to leave alive... then he [[{{Troll}} chuckles and admits he's just messing with them]]. After an intensely awkward {{Beat}}, he adds "but seriously, ''don't tell anyone''".

* ''Manga/MariaNoDanzai'': Because she miscalculated [[EvilIsPetty how petty and impatient Shikimi was]], Maria is forced to [[IndyPloy improvise]] and [[SexFaceTurn seduce Iijima]] when [[DisproportionateRetribution he is sent to beat her up for taunting Shikimi]]. Maria quickly understands that, once she kills Shikimi and her death is investigated, the police could easily draw a connection between Maria and Shikimi if Iijima were to give them her name and face, and decides to kill him to prevent that. [[SubvertedTrope Ultimately she can't bring herself to do it]] after seeing [[MoralityChainBeyondTheGrave an apparition of Kiritaka]] remind her that [[MisplacedRetribution Iijima is not guilty for his death]], and [[EveryoneHasStandards Maria agrees that killing him would be excessive]]; instead, she decides to silence him by other means, but finds that Iijima has disappeared after Shikimi's death. Maria has to race to find him before the police or [[BigBad Okaya's]] gang can find him first. [[spoiler:In the end we never get to see exactly how Maria intended to silence Iijima, as he's found dead a week after Shikimi's death after being killed by an unknown party before any of Maria's enemies could find him.]]

* ''Film/UnFlic:'' One of Simon's gang is shot and wounded in a bank robbery, and is put into a private clinic for treatment. They soon realise that the police will find him. Simon and one of his henchmen disguise themselves as paramedics to "take him to another clinic," but the receptionist won't let them move the badly wounded man. [[spoiler:So Simon's girlfriend, who is disguised as a nurse, walks into the man's room and gives him a lethal injection]].

* ''Manga/MariaNoDanzai'': Because she miscalculated [[EvilIsPetty how petty and impatient Shikimi was]], Maria is forced to [[IndyPloy improvise]] and [[SexFaceTurn seduce Iijima]] when [[DisproportionateRetribution he is sent to beat her up for taunting Shikimi]]. Maria quickly understands that, once she kills Shikimi and her death is investigated, the police could easily draw a connection between Maria and Shikimi if Iijima were to give them her name and face, and decides to kill him to prevent that. [[SubvertedTrope Ultimately she can't bring herself to do it]] after seeing [[MoralityChainBeyondTheGrave an apparition of Kiritaka]] remind her that [[MisplacedRetribution Iijima is not guilty for his death]], and [[EveryoneHasStandards Maria agrees that killing him would be excessive]]; instead, she decides to silence him by other means, but finds that Iijima has disappeared after Shikimi's death. Maria has to race to find him before the police or [[BigBad Okaya's]] gang can find him first.

* ''Manga/MariaNoDanzai'': Because she miscalculated [[EvilIsPetty how petty and impatient Shikimi was]], Maria is forced to [[IndyPloy improvise]] and [[SexFaceTurn seduce Iijima]] when [[DisproportionateRetribution he is sent to beat her up for taunting Shikimi]]. Maria quickly understands that, once she kills Shikimi and her death is investigated, the police could easily draw a connection between Maria and Shikimi if Iijima were to give them her name and face, and decides to kill him to prevent that. [[SubvertedTrope Ultimately she can't bring herself to do it]] after seeing [[MoralityChain an illusion of Kiritaka]] remind her that [[MisplacedRetribution Iijima is not guilty for his death]], and [[EveryoneHasStandards Maria agrees that killing him would be excessive]]; instead, she decides to silence him by other means, but finds that Iijima has disappeared after Shikimi's death. Maria has to race to find him before the police or [[BigBad Okaya's]] gang can find him first.

** [[Recap/DoctorWhoS30E1PartnersInCrime "PartnersInCrime"]]: Matron Cofelia has been employed by the Adiposian First Family to breed a new generation after their breeding planet was "lost". The Doctor warns her that using a Level 5 Planet (Earth) as breeding ground is against Galactic Law. At the end, the Doctor learns that the Adipose are aware of this and they allow their "accomplice" to suffer a DisneyVillainDeath.

** [[Recap/DoctorWhoS30E1PartnersInCrime "PartnersInCrime"]]: Matron Cofelia has been employed by the Adiposian First Family to breed a new generation after their breeding planet was "lost". The Doctor warns her that using a Level 5 Planet (Earth) as breeding ground is against Galactic Law. At the end, the Doctor learns that the Adipose are aware of this and they allow their "accomplice" to suffer a DisneyVillianDeath .

** [[Recap/DoctorWhoS30E1PartnersInCrime "PartnersInCrime"]]: Matron Cofelia has been employed by the Adiposian First Family to breed a new generation after their breeding planet was "lost". The Doctor warns her that using a Level 5 Planet (Earth) as breeding ground is against Galactic Law. At the end, the Doctor learns that the Adipose are aware of this and they allow their "accomplice" to suffer a DisneyVillianDeath.

** [[Recap/DoctorWhoS30E8PartnersInCrime "PartnersInCrime"]]: Matron Cofelia has been employed by the Adiposian First Family to breed a new generation after their breeding planet was "lost". The Doctor warns her that using a Level 5 Planet (Earth) as breeding ground is against Galactic Law. At the end, the Doctor learns that the Adipose are aware of this and they allow their "accomplice" to suffer a DisneyVillianDeath.

* {{Defied|Trope}} on the ''WebVideo/DreamSMP''. Quackity considers killing Slimecicle for overhearing a [[{{Futureshadowing}} conversation between him and Purpled]] because of this trope, but decides against it, instead choosing to utilize Slimecicle's HiddenInPlainSight abilities for his own purposes, and recruits him as a spy for Las Nevadas.