drug overdose, sleeping pills. It is said he was haunted by his character the joker, and he was exhausted from insomnia, his sleeping pills werent doing enough so he took alot.. he was found in full cardiac arrest by his house keep and pronounced dead at 3:28 pm.... wow, I have been looking forward to this guy so much in the n ext batman film... im so upset. even thought we will still get to see the dark knight, it wont be the same...