Heath Ledger's death was accidental, the New York City medical examiner's office said Wednesday.

'Hollywood Minute' -- Ledger, Spears

According to examiner spokeswoman Ellen Borakove, Ledger died of an accidental overdose of prescription drugs that included painkillers, sleeping pills and anti-anxiety medication.

"Mr. Heath Ledger died as the result of acute intoxication by the combined effects of oxycodone, hydrocodone, diazepam, temazepam, alprazolam and doxylamine," medical examiner's spokeswoman Ellen Borakove said in a news release.

The drugs are the generic names for the OxyContin painkiller, the anti-anxiety drug Valium, Xanax, an anti-anxiety drug, and the sleep aids Restoril and Unisom.

Hydrocodone is a widely used prescription painkiller.

The "Brokeback Mountain" Oscar nominee died Jan. 22 after he was found unresponsive by his masseuse in his Manhattan apartment.

There for an appointment, the masseuse entered the bedroom to set up for the massage when she found Ledger.

She proceeded to call actress Mary-Kate Olsen three times over the next nine minutes before dialing 911.

Police found bottles of six types of prescription drugs, including sleeping pills and anti-anxiety medication, in his bedroom and bathroom, raising speculation of an accidental drug overdose.

Ledger's publicist also released a statement about the findings Wednesday, on behalf of the actor's father, Kim.

"While no medications were taken in excess, we learned today the combination of doctor-prescribed drugs proved lethal for our boy," Kim Ledger said. "Heath's accidental death serves as a caution to the hidden dangers of combining prescription medication, even at low dosage."

The 28-year-old actor appeared in such films as "The Patriot," "10 Things I Hate About You" and most recently, "I'm Not There."

He recently completed filming his role as the Joker in the "Batman Begins" sequel "The Dark Knight," which is scheduled for a July release. He was working on a film in London with director Terry Gilliam shortly before his death. The status of that project is still unclear.

Ledger's burial is expected to be in his native Australia.

Ledger is survived by a 2-year-old daughter that he had with his ex-girlfriend, actress Michelle Williams.