( CNN ) -- Actor Robin Williams was cremated and his ashes were scattered in San Francisco Bay , according to his death certificate . Williams was found dead in his Northern California home August 11 from what investigators suspect was a suicide by hanging . The certificate , obtained by CNN on Thursday , says his ashes were scattered off the coast one day later . It also says the cause of death is `` pending investigation . '' According to Marin County Assistant Deputy Chief Coroner Lt. Keith Boyd , investigators believe Williams used a belt to hang himself from a bedroom door . Boyd would not confirm or deny whether Williams left behind a letter , saying that investigators would discuss `` the note or a note '' later . The coroner 's investigation `` revealed he had been seeking treatment for depression , '' Boyd said . He spent time in a treatment facility in July , a time when his wife and representative have said he was battling depression . Media reports at the time speculated that Williams had resumed drinking alcohol , but a statement from his wife appears to dispute those reports . Williams was sober but struggling with depression , anxiety and the early stages of Parkinson 's disease when he died , his widow said last week . `` Robin spent so much of his life helping others , '' she said . Whether he was entertaining millions on stage , film or television , our troops on the front lines , or comforting a sick child -- Robin wanted us to laugh and to feel less afraid . '' I met Robin Williams : Your stories and never-before-seen photos . CNN 's Alan Duke contributed to this report .
Widow : Williams was struggling with depression and the early stages of Parkinson 's disease . The actor was found dead in his Northern California home August 11 . Hide Caption 8 of 127 Photos:Photos: People we lost in 2014