Heath Ledger

Heath Ledger is a known actor on Earth-1.

Biography
At some point Heath Ledger portrayed the notorious and mysterious criminal from Gotham City known simply as the "Joker".

Behind the scenes

 * In the real world Heath Ledger (April 4, 1979 – January 22, 2008) was an American actor best known for his role as the Joker in The Dark Knight.