Total Nerd 29 Superheroes Who Have Killed People  

Ranker Comics
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While comic villains are usually content with killing anyone and everyone to prove their point, the heroes almost always have a "no killing" rule. Killing and no killing is seen as one of the major dividing lines between a hero and a villain. Even so, that doesn't mean there haven't been a few accidental--and some not so accidental--deaths caused by various superheroes. 

Everyone from Batman to Iron Man to Superman have accidentally killed people, with varying degrees of accident. This list of times heroes have accidentally killed people shows the accidental deaths of various characters at the hands of heroes, some of which had huge consequences in the comic universes. 

Spider-Man Accidentally Kills Gwen Stacy

Spider-Man Accidentally Kills ... is listed (or ranked) 1 on the list 29 Superheroes Who Have Killed People
Photo: Gil Kane/Marvel Comics

The Amazing Spider-Man #121

After kidnapping Gwen Stacy and the ensuing fight with Spider-Man, Green Goblin threw Stacy over the side of a bridge, plunging her to her death. Not having enough time to swing down to her, Spider-Man shot some webbing down to grab her and the sudden stop snapped her neck.

Superman Kills Lois Lane

Superman Kills Lois Lane is listed (or ranked) 2 on the list 29 Superheroes Who Have Killed People
Photo: Tom Taylor/DC Comics
Injustice: Gods Among Us #1 
After being gassed with fear toxin laced with kryptonite by the Joker, Superman thinks Lois Lane is Doomsday. It's only after he's taken her to space and killed her that the effects wear off and he sees the terrible action he's committed.

Speedball and the New Warriors Accidentally Kill an Entire Town

Speedball and the New Warriors... is listed (or ranked) 3 on the list 29 Superheroes Who Have Killed People
Photo: Mark Millar/Marvel Comics

Civil War #1

The New Warriors were looking for better ratings on their reality television show when they took on the criminals Nitro, Coldheart, Cobalt Man, and Speedfreek, but none of them were expecting how strong Nitro would be. During the battle, Nitro caused an explosion which obliterated the nearby town of Stamford, CT, and led to the superhero Civil War.

Hawkeye Accidentally Kills Egghead

Hawkeye Accidentally Kills Egg... is listed (or ranked) 4 on the list 29 Superheroes Who Have Killed People
Photo: Roger Stern/Marvel Comics

Avengers #229

Before the other Avengers can rescue him, Hank Pym single-handedly defeats the Masters of Evil and Egghead. As the other Avengers arrive and to celebrate the victory, Egghead tries to shoot Pym in the back, but has his gun barrel plugged by Hawkeye's arrow, causing it to explode and kill him.