It's been nine days since Philip Seymour Hoffman was discovered dead in his West Village apartment. His cause of death is still under investigation, after an initial autopsy was "inconclusive," but it's believed he overdosed on heroin, as empty and full envelopes of the drug were found in his apartment, along with a syringe in his arm. Now, law enforcement sources say his diary detailed his struggles with addiction.

NBC News reports: "According to multiple sources familiar with the contents, the hand-scrawled entries make reference to drug deals, to the actor’s struggle with his “demons,” and his attempt to stay clean by attending Narcotics Anonymous meetings in lower Manhattan. But the diaries are also hard to read, with scribbled lines, and sentences that run into each other. The handwriting sometimes starts out clearly and then becomes illegible, said a source, as if he had written parts of the diaries while high."

A source said, "It’s stream of consciousness and difficult to follow. In one line he refers to ‘Frank who always owes money’ and on the same page he writes about a 15-year-old girl from Texas." Another told NBC News, "It seems he did at least part of it in rehab. It definitely contained some soul-searching. But there is also a fair amount of rambling that doesn’t make sense."

Hoffman had kicked a substance abuse problem when he was 23 years old, but relapsed in late 2012, going to rehab in May 2013. At one point he reportedly said, "If I don't stop, I know I'm gonna die."