Heath Ledger died of an accidental overdose

Heath Ledger died of an accidental overdose of prescription drugs that included painkillers, sleeping pills and anti-anxiety medication, the New York City medical examiner says.

"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 that was reported by The Associated Press.

The medical examiner's office only provided generic names, so it is unknown whether he took generic or brand-name drugs, according to The Associated Press. Police had said they found six types of prescription drugs, including sleeping pills and anti-anxiety medication, in Ledger's apartment.

Oxycodone is a painkiller marketed as OxyContin and used in other painkillers such as Percodan and Percocet; hydrocodone is used in a number of painkillers, including Vicodin. Diazepam and alprazolam are the generic names for the anti-anxiety drugs Valium and Xanax, and the other two drugs are sleep aids commonly sold under the brands Restoril and Unisom, according to The Associated Press.