Comedian Robin Williams
Robin Williams at the Television Critics Association Cable summer press tour in Pasadena, California July 30, 2009. REUTERS/Mario Anzuoni

Robin Williams, the legendary actor and stand-up comic, was found dead in his Northern California home Monday. He was 63.

The cause of death is believed to be “suicide due to asphyxia,” according to the Marin County Sherriff’s Office. The office said “a comprehensive investigation must be completed before a final determination is made.” A forensic examination is currently scheduled for Tuesday, and toxicology testing will be conducted afterward.

Williams’ rep issued the following statement: “Robin Williams passed away this morning. He has been battling severe depression of late. This is a tragic and sudden loss. The family respectfully asks for their privacy as they grieve during this very difficult time.”

His wife, Susan Schneider, told the Hollywood Reporter: “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. On behalf of Robin's family, we are asking for privacy during our time of profound grief. As he is remembered, it is our hope the focus will not be on Robin’s death, but on the countless moments of joy and laughter he gave to millions.”

The actor rose to fame on the 1970s sitcom “Mork & Mindy” and recently returned to television on the short-lived CBS comedy “The Crazy Ones.”

Williams has a known history of addiction problems and was back in rehab as recently as July to “focus on a continued commitment to sobriety.”

A press conference on the investigation into Williams’ death will be held on Tuesday at 11 a.m. at the Sheriff’s Office Assembly Room in San Rafael, California.