Philip Seymour Hoffman died accidentally of acute drug intoxication, New York officials announced Friday.
Hoffman, an Oscar-winning actor as well as a producer and director, was found in his Manhattan apartment Feb. 2. Drugs, including heroin, were found on the scene.
In an email, the office of New York's chief medical examiner confirmed that Hoffman, who had battled addiction, had died from "acute mixed drug intoxication" with substances including heroin, cocaine, benzodiazepines and amphetamines.
The official ruling was an accidental death.
The actor had entered a drug rehabilitation program in 1989 when he was 22 and had been sober for more than two decades until he relapsed in 2013. He checked himself into rehab in May.
Hoffman's body was found by a friend, playwright and screenwriter David Bar Katz.
Hoffman won an Academy Award for his portrayal of writer Truman Capote in the 2005 film "Capote" and was nominated three times for best supporting actor.
His funeral was held Feb. 7 at St. Ignatius Loyola church in Manhattan.
He is survived by his partner and three children.