No illegal drugs or alcohol were found in Robin Williams' system upon his death, according to an autopsy report released by the Marin County sheriff's office Friday. The coroner ruled his death a suicide, due to asphyxia by hanging.
Williams was found dead Aug. 11 in his California home.
Williams' wife, Susan Schneider, revealed in August that the actor was in the early stages of Parkinson's disease, and that he battled depression and anxiety. Schneider said Williams' sobriety "was intact."
Williams rose to fame in the 1970s when he played the character Mork in the TV series "Mork & Mindy." He went on to have a long career in both acting and stand-up comedy. Williams took home a best supporting actor Academy Award for his performance in "Good Will Hunting."
In a statement on Williams' passing, President Obama called Williams "one of a kind. He arrived in our lives as an alien – but he ended up touching every element of the human spirit. He made us laugh. He made us cry. He gave his immeasurable talent freely and generously to those who needed it most – from our troops stationed abroad to the marginalized on our own streets."