Just made public, the results of Heath Ledger's autopsy tell that the actor's death on January 22nd was due to an accidental overdose of prescription drugs. "Mr. Heath Ledger died as the result of acute intoxication by the combined effects of oxycodone, hydrocodone, diazepam, temazepam, alprazolam, and doxylamine," spokesperson Ellen Borakove released in a statement on Wednesday morning .