10 Shocking Times The Joker Died
8. Nightwing Beat Him To Death - Joker: Last Laugh #6
While locked up in the Slab penitentiary, the Joker was informed by the consultants that he was suffering from a terminal brain tumour. This diagnosis was a ploy by the staff, hoping the Joker would acknowledge his wrongdoings if he was faced with his own mortality.
This plan backfired as the Jester of Genocide decided to go out with a bang. He infected countless villains across the globe with a special concoction of Venom so they took on the appearance and mannerisms of the Joker. When The Batman Family tried to stop him, Killer Croc had Robin captured. When Huntress found Croc in the sewers, she located Robin's torn uniform, and assumed the worst.
Believing Robin was dead, the original Robin, Dick Grayson, tracked down the Joker and pounded him to a pulp. Suddenly, Robin appeared and begged Dick to stop. Dick believed Robin was "an illusion, another sick joke" and continued to wail on the Ace of Knaves until he was dead. Batman managed to revive him with CPR, but Dick was still disgusted that he took a human life.