Robin Williams killed himself: Sheriff official
Aug 13 2014 , San Rafael (California)
Marin County Sheriff's Lt. Keith Boyd said Williams was found in a bedroom by his personal assistant yesterday.
Boyd said toxicology tests will be performed and the investigation is ongoing.
Sheriff's officials said a preliminary investigation determined the cause of death was suicide due to asphyxia.
Williams was 63 and had periodic bouts of substance abuse and depression.
Williams' press representative Mara Buxbaum said the actor had been battling severe depression recently. Just last month, Williams announced he was returning to a 12-step treatment program.
Coroner's officials say he was last seen alive at home around 10 pm. Sunday.