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An autopsy report is confirming neither drugs or alcohol played a role in Robin Williams' death last August. The report released Friday declares the actor's death a suicide caused by asphyxia due to hanging. 

According to the Marin County Coroner, toxicology tests showed no sign of alcohol or illicit drugs. Traces of prescription medications were detected in what the report described as "therapeutic concentrations." 

Williams was found dead at his home in northern California on August 11th. The Oscar winner had struggled with depression for years. At the time of his death, his wife said the actor was also in the early stages of Parkinson's disease.  Robin Williams was 63.  

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