Last night, sources told Mail Online that Ledger had been battling substance abuse problems - including an addiction to heroin - for some time.
"He had a stint in rehab late last year when he was treated for heroin," a source told The Daily Mail, adding that Ledger was increasingly introverted at the time of his death...
...An insider disclosed that the Brokeback Mountain star had been battling substance abuse problems for some time.
Perth-born Ledger took his break-up with Williams last September very badly, according to the source.
"Heath was shattered by his split from Michelle," the source told Mail Online, adding: "He became a recluse. He barely slept he was dealing with terrible mood swings."
Ledger spent the past several months mourning the loss of his relationship with Williams and friends say he had become an introvert, who was headed in a downward spiral.
"Heath totally wanted to be on his own these past few months since he and Michelle split in September," says a source. "She was very much in love with him, but the fact he continued to dabble in drugs kept their relationship from being one she could rely on.
"He adored his daughter Matilda, and when Michelle called it quits, he missed Matilda so much that he was thrown into a deep dark depression.
"Heath was living in New York to be close to his daughter. But he hardly ever ventured out anymore.
"His close friend and Brokeback co-star, Jake Gyllenhaal has been worried about him for months. And he knew Heath was sinking further into a depression. Jake is Matilda's godfather, and he and Heath had become really close since they did the film Brokeback together.
"Jake wanted Heath to get help, but he refused, and now it looks as though he may have died of a drug overdose.
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