Robin Williams was not under the influence of illicit drugs or alcohol when he committed suicide in August, although a coroner's report concluded the had "prescription drugs" in his system.
The comedian and actor, 63, was found dead in his California home on Aug. 11. The Marin County coroner's report released on Friday found he died from "asphyxia due to hanging."
The report also said "prescription medications were detected in therapeutic concentrations," but did not elaborate.
Williams, who starred in box-office bonanzas like Good Morning Vietnam, Mrs. Doubtfire, Jumanji and Good Will Hunting, had been treated for depression and had spoken often about his battles with drugs and alcohol. One of his aides said the actor had been "battling severe depression" before his death and there were reports that he had broken from his years of sobriety.
Agence France Press reported:
'His prior medical history reportedly included depression, Parkinson's Disease and a recent increase in paranoia,' said a longer coroners' report, which was obtained by AFP.
The report included other details about Williams' medical history, including that he had shown symptoms of Parkinson's since 2011, including a left arm tremor and slowing of left hand movements. He was diagnosed with the disease in November 2013.
'The clinical history is notable for depression, with components of paranoia, compulsiveness and anxiety,' it said.
Although he had suffered from depression sporadically 'for most of his adult life... he had no known history of suicidal ideation or behavior,' the report said.
The report gave a detailed description of how Williams' body was found hanging by a belt from a closet door in his stepson's bedroom. It noted that a pocket knife with a 3-inch (7.5-centimeter) blade was found near the body.
'Several superficial vertical and horizontal cuts were seen over the inner aspect of the left wrist; these wounds had a scant amount of blood present,' the report said