Actor Robin Williams was found dead in his home on Monday, according to the Marin County Sheriff’s office. The cause of the death is still unknown but suicide by asphyxiation is suspected as the cause of death, according to the coroner’s office.

“Robin Williams passed away this morning. He has been battling severe depression of late," his publicist said in a statement. "This is a tragic and sudden loss. The family respectfully asks for their privacy as they grieve during this very difficult time.” 

Williams was nominated for an Oscar for Best Actor three times, and took home an Academy Award for Best Supporting Actor for his performance in 1997’s Good Will Hunting.