Fiddle Licked: A CIA agent posing as a violinist in a fancy restaurant uses an experimental laserrifle to kill a terrorist posing as a man on a date.
M.R.Ouch: A smokin' hot nurse who once was in the military tries to disarm a gun-toting drug addict with an MRI machine — and ends up killing him when the metal plate in his head also gets attracted.
And unlike the Ex'd Ex example, this could easily be classified as self-defense or justifiable homicide due to the man carrying a gun and already having a police record, meaning despite leading to the junkie's death, the nurse will likely recieve at most a warning or probation.
Wrin-Killed: A purse-snatcher gets his trachea smashed by a little old lady with 30 years' experience in Tae Kwon Do when he tried to take her purse. Eagerly and hilariously lampshaded in the recreation itself, since the bystanders actually start cheering for the grandma as they watch on how she curbstomps the Asshole Victim.
Radium Girls: In this case, it's not the death that is a crowning moment, but the aftermath of said death. A woman from the 1920s named Wendy died by covering herself with glow-in-the-dark, radioactive paint (using it as body paint for her lover during sex), and contracted bone cancer. The company she worked for knew about the dangerous effects of radium, yet used it in their paint anyway, and in fact encouraged the female workers to keep their paintbrushes sharp by licking them, and thus consuming dangerous radioactive material. After the woman's death, her co-workers filed one of the first successful workers' rights lawsuits, won, and according to the narration, "increased safety standards across America." The Other Wiki confirms this as the truth; it was the first successful lawsuit of its kind in the United States.
Suck Her Punched: A rapist mistakes a cross-dressing boxer (who cross-dresses as a means to calm down from his Testosterone Poisoning) for an actual woman and attacks him. The boxer defends himself and kills the rapist with his strong right cross (triggered whenever someone calls him a "lady").
Ex'D Ex: A man takes his girlfriend on a hay ride and proposes. Her jealous ex-boyfriend, who had been stalking them, angrily puts on a ski mask and jumps on the ride carrying an axe. The man reflexively punches the ex out, knocking him into the road, where he gets run over.
Loses all awesomeness when they see it's their old friend and the girl bursts into tears...
Back Stabbed: A Viking leaves his brother in charge of his village while he goes marauding. The brother abuses this power to rape the women in the village, including his brother's wife. Eventually, the marauding brother returns and catches the rapist, and kills him by cutting his back open and ripping his lungs out (this is called the "Blood Eagle").
Nygarde: I'm gonna take your life! I'm gonna do it the worst way we know how!
Orspasm: A woman with PGAD (a condition that makes people orgasm from the slightest vibration) is tormented by her current boyfriend, who makes her orgasm for his own pleasure. One day, he pokes her with a muscle massager, and she orgasms, which causes her to knock him down the stairs, killing him. Even if it was an accident, it was pretty awesome seeing her do that.
Homie Invasion/Homie's Dead: A thief named Vince sneaks into a couple's house and attacks the husband with a baseball bat when he investigates, killing him. The wife tries CPR, but it doesn't work. However, after she leaves in grief (and a fake title card), the man wakes up, as apparently her CPR caused what's known as "Lazarus Syndrome". As Vince is trying to climb down the balcony, the husband's revival scares the hell out of him, causing him to fall three stories onto solid pavement.
Narrator: There'll be no resurrecting you, Vince. Ya rat bastard.