Comic book characters are forever being killed and resurrected, and The Joker is no different. The villain was done away with a number of times in the 40s, but constantly returned to plague the Dark Knight. He's also been believed dead in recent years too, with the latest coming in the pages of Batman: Endgame. In that, he was seen bleeding out alongside Batman deep underground as the two arch enemies were buried in rubble. That's just one recent example of countless others though, and The Joker has seemingly been killed in a variety of ways over the past 75 years or so. Those include during a battle with Batman on an unfinished skyscraper which saw him struck by lightning, being executed for his crimes (and later waking up in the morgue thanks to a mysterious serum), fires, explosions, and even one time when Batman accidentally tossed him into a lion pit! He always finds a way back those, sometimes with an explanation as to how, but usually without.
