Almost 50 bags of heroin were found at the home of Philip Seymour Hoffman following his death, according to police sources.
The Oscar-winning actor – who was found dead at his New York apartment on Sunday – also had 20 used syringes in his flat, it has emerged.
Yesterday, David Katz, who discovered the star in the bathroom of his West Village home, spoke out about his friend's death.
"I saw him last week and he was clean and sober – his old self," he told the New York Times. "I really thought this chapter was over."
The writer said he had decided to go over to the actor's flat after he failed to pick up his three children from his ex-partner Mimi O'Donnell.
Friends of the star said the 46-year-old actor spiraled into depression and relapsed into drug addiction following the breakdown of their 12-year relationship.
A source told The Mirror: “After Phil and Mimi split he just couldn’t handle it.
“Gradually he became more and more of a recluse and would lock himself away for days not wanting to see anyone.
“Whenever Phil talked about his previous battles with drink and drugs he made no secret of the fact that at the time if he had had more money he would have wound up dead.
"But after his Oscar success he became incredibly wealthy and was able to buy as many drugs as he wanted.
“Ultimately, his fame and fortune cost him his life. Dealers saw Phil as easy money and he was paying over the odds for what he was using.”
It is thought Hoffman cleaned up after entering rehab last summer but relapsed after splitting with Mimi in October.
Yesterday his family said: “We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support we have received from everyone.”