Philip Seymour Hoffman died from a fatal mix of heroin, cocaine and prescription pills, coroners have ruled.

The tragic Capote star, 46, passed away from a suspected drug overdose at his New York City home on 2 February (14), but an initial autopsy proved inconclusive.

Officials at the city's medical examiner's conducted further toxicology and tissue tests, and the results have since revealed he had anti-anxiety medication benzodiazepines and stimulants amphetamines in his system, in addition to the illegal substances.

The mixing of heroin and cocaine is known as speedballing - the same combination which killed comedian John Belushi and actor River Phoenix, reports Tmz.com.

Hoffman's official cause of death has been listed as acute mixed drug intoxication.