"The Dark Knight" actor Heath Ledger died of an accidental overdose of prescription drugs, the New York City medical examiner's office has ruled.
In January, the 28 year-old thespian was found dead at an apartment he had been renting for several months in Manhattan.
A spokeswoman for the medical examiner said Ledger died "as the result of acute intoxication by the combined effects" of six different drugs.
They include painkiller Oxycontin and anti-anxiety drugs Valium and Xanax.
Last week, his former partner Michelle Williams spoke publicly for the first time since the star's death, saying: "My heart is broken."
The pair met on the set of their film Brokeback Mountain.
The couple, who had a daughter Matilda, now two, split up last September.
He'll portray The Joker in "The Dark Knight" film, to be released this summer.
