Philip Seymour Hoffman
Actor Philip Seymour Hoffman poses during the photocall of the movie "The Master" at the 69th Venice Film Festival in Venice Sept. 1, 2012. Reuters/Max Rossi

Philip Seymour Hoffman, who was found dead on Feb. 2 on the bathroom floor of his New York apartment, died of a toxic drug mix including heroin, cocaine, benzodiazepines and amphetamine, which are psychoactive drugs, the New York medical examiner’s office reportedly said Friday.

The medical examiner’s office ruled the death an accident. It is yet to be confirmed if Hoffman had taken the mixture of drugs around the same time or over a longer period of time, or whether the combination was ultimately made fatal by the addition of heroin.

Hoffman, who had openly discussed his battle with substance abuse, checked into rehab last year after a relapse following more than two decades of sobriety.

Authorities had found dozens of packets of heroin at his home during the investigation, along with a dozen used and unused syringes, and his death was being investigated as a probable accidental overdose.

In another development, Robert Vineberg, an NYC jazz musician, has been charged with keeping a heroin stash in a lower Manhattan apartment amid the investigation into Hoffman's death. Vineberg, who has said he was a friend of Hoffman, has not been charged in his death and has said that he did not sell the drugs to the acclaimed actor.

Two other people arrested in connection with Hoffman's death -- Juliana Luchkiw and Max Rosenblum, both 22 -- were released earlier this month until their next court dates.

Hoffman was mourned on Feb. 7 in New York at a star-studded private funeral attended by family and close friends.

Nominated for an Academy Award four times, Hoffman won the Oscar for best actor in 2006 for "Capote." He earned Academy Award nominations for roles in "Charlie Wilson's War," "Doubt" and "The Master."