In Batman: Crimson Mist, Killer Croc begins as a rumoured serial killer stalking Gotham's sewers, later joining Two-Face's gang as the muscle.
In the second volume of Batman: Earth One series, in contrast with the mainstream continuity's version, Waylon Jones appears benign and is not a cannibal, and is dubbed "Killer Croc" by the media due to his ichthyosis condition.