Jack Napier, you’ll remember, is the same name of the man who eventually becomes the Joker in Tim Burton’s Batman from 1989, meaning that in a way, we’ve known the Joker’s true identity for almost three decades now.
Following DC Comics 2011 relaunch of several of its comic series for The New 52, Detective Comics #1 (November 2011) sees the Joker captured by Batman and sent to Arkham Asylum; unbeknownst to Batman, this is part of the Joker’s plan to meet with the villain Dollmaker, who surgically removes Joker’s face at his request. No, the joker did not died in the end of The dark knight. Batman handed him over to the Gotham police, before leaving the site. In a interview, it was mentioned that after death of Heath Ledger, Christopher Nolan was very sad and had given up plans for any future Batman movie after The dark knight (2008).