The death of Oscar winning actor Robin Williams has been officially ruled a suicide.
A toxicology test on Williams' body revealed the absence of alcohol or illicit drugs in his system.
Prescription medications were detected in concentrations consistent with their use for therapeutic purposes, according to a statement from the Marin County Sheriff's Office.
The body of the 63-year-old was found on 11 August by a personal assistant at his home in the San Francisco Bay area.
Williams was suffering from the early stages of Parkinson's disease and from severe depression, his widow Susan Schneider said soon after his death.
He was one of the world's most famous stand-up comedians and earned an Oscar for his role in the 1997 drama 'Good Will Hunting'.
Williams also starred in the comedies 'Good Morning, Vietnam,' 'Mrs Doubtfire' and 'Night at the Museum'.
