Robin Williams was sober and suffering from early stages of Parkinson's Disease as well as anxiety and depression at the time of his apparent suicide, the actor's wife has said in a statement.
Susan Schneider said the actor "was not yet ready to share publicly" his struggles with Parkinson's Disease.
"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," Ms Schneider said in the statement.
The 63-year-old Oscar-winning star of such films as Mrs. Doubtfire and Good Will Hunting was found dead at his San Francisco-area home by his personal assistant on Monday.
Williams had been open about his struggles with alcohol and cocaine and in the past months had entered a rehabilitation center to help him maintain sobriety.
The death of Williams, who came to prominence in the 1970s with his groundbreaking hyperactive comedic style, shook Hollywood as tributes poured out from actors, directors, politicians and generations of fans.