10 DC Characters Who Killed Superman (And What Happened To Them)
6. Killer Frost
The most interesting part of the entire Justice League vs. Suicide Squad six-issue series is undeniably the moment wherein it's revealed that Killer Frost can basically take down anyone, proving this once and for all when she kills Superman by draining all of his power from him.
Although this does initially not appear as though it's a killing blow - as Superman does appear in one of Amanda Waller's containment cells later - the end of the comic clearly shows us that this exact move is lethal, as Waller demands Frost finish off Maxwell Lord by doing the exact same thing.
This in mind, it appears as though Waller had Frost kill Superman, before reviving him in hopes to have him and the Justice League form a new team under her control - exactly the same way as when she revived Deadshot in the Suicide Squad series.
Mercifully, both characters end up surviving the comic series, with Frost being taken under Batman's wing to become a fully-fledged hero in her own right.