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The coroner in Marin County, Calif., has officially ruled Robin Williams’ death a suicide by asphyxia due to hanging. No alcohol or illegal drugs were involved, according to the statement released on Friday.

Williams was found dead Aug. 11 at his home in the Northern California town of Tiburon.

Prescription drugs for Parkinson’s Disease, anxiety and depression were found at normal levels, according to the autopsy report.

The actor’s family revealed shortly after his death that Williams had been suffering from all three conditions.

“It is our hope in the wake of Robin’s tragic passing, that others will find the strength to seek the care and support they need to treat whatever battles they are facing so they may feel less afraid,” his wife, Susan, said at the time.

“Robin spent so much of his life helping others. Whether he was entertaining millions on stage, film or television, our troops on the frontlines, or comforting a sick child — Robin wanted us to laugh and to feel less afraid. Since his passing, all of us who loved Robin have found some solace in the tremendous outpouring of affection and admiration for him from the millions of people whose lives he touched. His greatest legacy, besides his three children, is the joy and happiness he offered to others, particularly to those fighting personal battles.”

Williams is survived by his wife and three children.