yeah... he reported began having trouble sleeping while filming the Batman movie. He said it was very intense playing a sociopath like the Joker and then he went right into another emotionally wringing role, which made it even harder to sleep. He was quoted recently to have said he was getting less than 2 hours sleep a night. The unofficial cause of death seems to be mixing a prescription sleeping pill with an over the counter sleeping pill but the autopsy isn't until tomorrow.
And he has a daughter, Matilda, with Michelle Williams. They were known to be very devoted parents. When they split they put identical rooms in their homes for their daughter's bedroom so she'd feel like she was in the same room.
It's very sad. He was an extremely good actor. His death so suddenly and so unexpected I can easily see him becoming somewhat of the James Dean of our generation.
