Williams appeared to have died of asphyxiation, according to the Marin County coroner’s office.
There are scant few details available at the moment from authorities, but gossip site TMZ is reporting that the actor killed himself.
Williams has been battling severe depression, the Web site reported citing people close to the actor. Williams was last seen alive at his house at 10 PM Sunday night (Aug. 10).
Robin spent some time in rehab last month to deal with alcohol-related problems. He may have been experiencing financial difficulties, although he was working on a number of projects, among them a sequel to his hit 1993 film “Mrs. Doubtfire.”
He has four films in the can or in post-production this year, including “The Angriest Man in Brooklyn” “Night at the Museum: Secret of the Tomb,” A Friggin’ Christmas Miracle” and “Boulevard.”
Williams had been trying to sell his expansive mansion and vineyard, known as Villa Sorriso, located in the Mayacama Mountains, straddling Napa and Sonoma Valley.
The 635-acre property was previously priced at $35 million, but Williams slashed the price to $29.9 million in May. The property is still on the market, according to an online listing.
Williams had a serious heart condition that required open-heart surgery and had struggled with alcohol and drug use early in his career.
His wife, Susan Schneider, issued a brief statement. “This morning, I lost my husband and my best friend, while the world lost one of its most beloved artists and beautiful human beings. I am utterly heartbroken.”
Williams was nominated for a Best Actor Oscar three times and won the Best Supporting Actor Award for his role in 1997’s “Good Will Hunting.”