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"I'm going to kill you, then myself. It's my only choice. This is the only way to free you from Naraku! Forgive me, Kohaku!"
Sango, Inuyasha
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Something horrible has happened or is happening to Alice. Her pain is unbearable. Even her loved ones look away and cover their ears, trying to block out the sights and sounds of her agony. There is nothing they can do to ease her pain or save her. But they can offer one last mercy to their friend: they can end it all for her now, before it gets any worse.

Whatever is afflicting Alice is usually in the category of a Fate Worse than Death (thus making the death a kindness). There may be a Body Horror that nobody can figure out how to destroy. Or Cold-Blooded Torture has left her horribly maimed and screaming incoherently. Maybe she's being Eaten Alive. Or perhaps she's about to succumb to The Virus or The Corruption, and she wants to Die As Herself. It may be that she could survive, but they have no access to medical care; or that Alice, if she lived, would be reduced to a shell of her former self. Whatever the reason, this trope implies that death is the merciful option, even if Alice is begging for her life (or is so overcome that she cannot speak at all).

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Instant Death Bullet is likely, and justified in this situation: the killer has no difficulty getting to a position and attacking in a manner that would cause quick death. There is usually a moment when a glimmer of self-awareness allows Alice to show her gratitude through a tearful smile or the like. This is usually easier when the shooter is Cradling Their Kill.

When several people could do it, it is likely that her closest friend will insist on being the one to give the fatal blow; compare Dying Alone.

The Medic, even if holding to Thou Shalt Not Kill, may make an exception for these.

Note that in Real Life, euthanasia is extremely controversial. Whereas some jurisdictions allow for the killing of a person with the killed person's consent (arguing that a person's free will is legally paramount), other jurisdictions penalise the killing of another person even in such cases (arguing that the sanctity of human life is legally paramount). In either case, it is usually an incredible Tear Jerker.

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Not to be confused with Put Them All Out of My Misery. Very common in zombie stories, for obvious reasons.

Contrast Cruel Mercy, which aims to do the exact opposite. Compare the combat-ending Coup de Grâce, the villainous Thwarted Coup de Grâce, and the assisted-suicide I Cannot Self-Terminate. See also Staking the Loved One, where this is usually the motive. A subtrope of Shoot the Dog, whose trope namer was a Mercy Kill. A Mercy Kill Arrangement is when a character arranges another character to perform their own Mercy Kill.

As a Death Trope, several if not all spoilers will be unmarked. You have been warned.


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    Audio Plays 
  • Big Finish Doctor Who: In Son of the Dragon, Radu performs one of the soldier the Doctor is attempting to save When the Doctor objects, Radu points out that even if the Doctor saves him from blood loss, the wound is poisoned and the man will die a few days hence, and that they have not the resources to care for him in any case.

    Comic Strips 
  • Subverted in Knights of the Dinner Table. After Windel the hireling is wounded by a dragon, Bob thinks he's begging him for this, and kills him.
    Sara: "Actually, I think Windel was pleading for us not to kill him, Bob. His wounds weren't really that serious."
  • Played for rather dark laughs in one Willie And Joe panel: a Cavalry sergeant standing over a Jeep with a broken axle, about to shoot it like a horse with a broken leg.

    Music 
  • Tears for Fears: In "Last Days on Earth", the narrator's loved one has terrible chronic pain, and the patient wants to undergo euthanasia to end their suffering.
    Tired of this elegant life
    With the best will in the world
    It's a thorn in your side

    Dazed, not a little confused
    Let the patient do the work
    They got nothing to lose

    Talk away the pain for the very last time
    Like an echo in a cave
    Let it die in your mind
  • "Bobby" by Reba McEntire tells the story of a man who kills his wife after she suffers an accident that leaves her severely disabled.
  • "Pull the Plug" by Starz tells the story of a man who disconnects his comatose wife's life support.
    They left the room for a minute or two
    Now I know exactly what I'm going to do
    It's been so long since your vital signs went
    And you don't look the same in that oxygen tent

    Now if I get caught
    I don't care if I get hung
    I can't let my baby linger on in an iron lung
    Good-bye my sweet
    Understand what I've done
    You can't suffer no more if the motor won't run

    Podcasts 
  • Subverted on Sick Sad World. One killer framed his murder of his daughter with cerebal palsy (among other things) as this. Guest host Andrew Gurza said he had most of the same disabilities as the victim and found it scary that killing her was so easy for her dad. All the hosts found it disturbing that a lot of people agreed it was an act of compassion rather than something selfish and cruel.

     Radio 
  • In the BBC Radio Four Afternoon Play "Countrysides", about a fox hunt saboteur, he is captured by two of the more sadistic hunters (contrasted with a nicer "It needs doing" one he met earlier), who deliberately torture a fox to near death in front of him and then leave him to put it out of its misery, gloating that he's the one who's actually killing the fox.
  • Dimension X's "Dwellers in Silence": Evans plans to kill the robot family so that they will not be lonely, but he ends up being unable to do so. Captain Parsons tells them that he will return with more fuel to bring them to Mars, instead.

    Sports 
  • On this less permanent level, many sports leagues and organizations have mercy rules in place where a game ends early if one team attains a presumably insurmountable lead after a defined point in the game. Usually, these are recreation and youth leagues, and to a somewhat lesser extent, high school and other sub-professional levels. Examples:
    • Baseball and softball: From youth leagues through semi-professional, a common standard for mercy rule is for the winning team to have a 10-run lead after the end of the fifth inning, although some leagues end games before that (usually, the earliest is the third inning) if the winning team has an even larger lead, such as 15 runs after four innings, with the home team, if they are trailing, having a final at-bat. Youth baseball games like Little League have it after the fourth inning, since those games usually last six innings rather than nine. This is a rare aversion to post-secondary teams having a mercy rule in place, as the college level and many semi-pro leagues often have some sort of mercy rule in these sports (although professional does not have this rule).
    • Basketball and football: Many state high school athletic associations use a "continuous clock" after a score differential is achieved after halftime. In this instance, the clock doesn't stop for things that it would normally be stopped for, such as going out of bounds or moving the down markers in football, or fouling in basketball, although the clock would stop for such things as time outs. States with continuous clock rules still often have the discretion to end a game early, provided that it is halftime or later.
    • Combat sports: technical knock-out, by which the referee can end the fight early if he deems one of the combatants cannot continue without risking permanent damage or worse. The act of throwing the towel and forfeiting a match is based on the same principle, only done by a fighter's cornermen even against his wishes.
    • Soccer: Most youth leagues and a number of state high school athletic associations have rules ending games at halftime or later if a certain goal difference is reached; usually, this is the leading team ahead by 10 goals.

    Tabletop Games 
  • Anathema: Technically every murder is this. Either you murder your victims or they, and everyone else, will suffer a slow, horrible, death as the planet becomes uninhabitable.
  • F.A.T.A.L.: It's a common joke that the spell of the same name, which kills absolutely everything in the world, is this. Oh, and it's possible to cast it by accident when you miscast an entirely different spell.
  • Mage: The Ascension has the Euthanatos, an entire splat of mages (player character mages, no less) who use this as their hat.
  • In Nomine: The Archangel Dominic deeply and genuinely believes that Falling is the worst thing that can happen to an angel — more than merely switching sides, it is a fundamental perversion of one's nature, dooming the former angel to ages of service to evil and to working against everything that they stood for and believed. As such, he considers sentencing Discord-riddled angels to death to be an act of mercy, since it gives a clean end to those who would otherwise Fall — die they may, but at least they die as angels and with their suffering cut short.
  • Ravenloft: Lycanthropy is even more virulent and dangerous than in most D&D settings, and this is the standard and expected outcome if an attempt to cure the affliction fails. As such a failure generally indicates an afflicted person is coming to like their condition, it's as much mercy for everyone else as for them.
  • Vampire: The Masquerade has Salubri antitribu with their special Discipline Valeren. One of the abilities of that Discipline is to give instant and painless death to any person actively willing it.
  • Warhammer 40,000: Humans refer to mercy kills as "the Emperor's Peace".
    • Space Marine Apothecaries carry a special pistol for just this purpose...and then they chainsaw open the chest of the fallen to get at his genetic material. With the utmost respect, of course; without those "gene-seeds", the many chapters of Space Marines wouldn't be able to replace their losses.
    • Similarly, but without the chainsaw, psykers carry what they call "Mercy Blades". When the Warp is trying to get into your head, a quick stab through the heart is vastly preferable.
    • The Commissar's (and formerly the Sanctioning Officer's) special rule "It's For Your Own Good" evokes this on psykers when their own hands cannot be trusted.
    • This is the standard Imperial response to any human infected by Genestealers. Since the infection is incurable by normal Imperial medicine, and causes the infectees and their children to be subordinated to the Tyranid Hive Mind, it's considered better for everyone to end it quickly.
    • Exterminatus could be considered this. When a world has been overrun by xenos or chaos forces and is beyond saving, Imperial forces will order the planet's biosphere wiped clean through orbital bombardment, cyclonic torpedoes, virus bombs or other methods of destruction, sparing the inhabitants of the planet from further suffering.
  • Warhammer Fantasy Roleplay: Amethyst wizards have a spell for Mercy Kills. It can be used on any enemy who has taken Critical Damage. This makes it very handy for dispatching that one beastman who has Tzeentch's own luck on the Critical Hit table and goes 3+ rounds without actually taking a Critical Hit that will kill him.

    Theatre 

    Visual Novels 
  • Danganronpa V3: Killing Harmony: Gonta is tricked into killing Miu when Kokichi tells him (after showing Gonta something that made him Go Mad from the Revelation about what was really outside the arena) that, if everyone guessed wrong on whodunnit, it would end with all the students being snuffed out (Kokichi included, but Gonta and the mastermind excluded) on the receiving end—sparing them the horror of realizing the same truth.
  • Fate/stay night:
    • In Heaven's Feel route, Shirou is forced to do this to Saber after she is hit by The Corruption and turned into Saber Alter. Especially bad, as Saber had been a symbol of purity throughout the game, and had been primary love interest in the first route.
    • In one bad ending Shirou is reduced to a torso and head suspended in a liquid that has left him drugged into insensibility. When Rin finds him she shatters the container, letting Shirou die.
  • Kerkan from Sekien no Inganock is a serial killer who believes everyone is eligible for a mercy kill, but tends to only pick the truly hopeless.
  • While all spirits in Spirit Hunter: NG are essentially being put to rest rather than forced to continue their tumultuous existence, this is explicitly the case with the Screaming Author, who outright asks Akira to set it on fire so that she can escape the monstrosity that her body has been turned into.
  • In one of the routes in Tsukihime, Akiha is succumbing to her demon blood and begs Shiki to kill her if she loses control. When she does, if you don't keep your promise and keep her alive, you get a depressing "Normal Ending" where she's basically become a mindless, bloodsucking doll under Shiki's care for the rest of her "life". If you do kill her, you get a Bad End. No, to get a decent ending you have to Take a Third Option. Also, Shiki killing Satsuki after she became a murderous vampire, earlier on.
  • In Crimson Gray, in the route for the good ending the protagonist is kidnapped by Dr.Smythe and injected with a drug designed to keep him in a state of agony. If the player made the choice to keep taking the medicine Dr.Smythe had been giving him, the drug's effect is irreversible, keeping him in a state of constant pain until Lizzie kills his captors she puts him out of his misery.

 
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This Feeling of Continuance

Robot commissions The Mauler Brothers to create a clone body for him made from Rex Splodes' DNA, only for the Clone to have a crisis of consciousness at his status of being a copy of the originals' mind instead of a full transfer like they had hoped it would be like.

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