Actor Robin Williams apparently hanged himself by a belt in the bedroom of his Tiburon home and also had slash marks on his left wrist, the county coroner's office disclosed Tuesday.

Williams had been seeking treatment for depression, said sheriff's Lt. Keith Boyd, assistant county coroner.

Boyd released the details after the autopsy was conducted Tuesday morning. Toxicology tests are pending on Williams, who had struggled with alcohol and drug abuse.

Williams, a Redwood High School graduate who studied at College of Marin, turned 63 on July 21. He died at his home on St. Thomas Way in unincorporated Tiburon.

Boyd said the preliminary investigation revealed that Williams was last seen alive Sunday night by his wife, Susan Schneider. She went to bed alone at about 10:30 p.m.

FILE - This June 15, 2007 file photo shows actor and comedian Robin Williams posing for a photo in Santa Monica, Calif. Williams, whose free-form comedy
FILE - This June 15, 2007 file photo shows actor and comedian Robin Williams posing for a photo in Santa Monica, Calif. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, died Monday, Aug. 11, 2014, in an apparent suicide. Williams was 63. (AP Photo/Reed Saxon, File) (Reed Saxon)

Schneider left the home at about 10:30 a.m. Monday, thinking Williams was still asleep in a different bedroom.

At 11:45 a.m., a personal assistant knocked on the door of the room where Williams was thought to be sleeping. When the actor did not respond, the aide became concerned and entered the room, finding Williams' body.

Williams was hanging from a belt secured between the door and the frame, Boyd said. He was partially suspended in a seated position with his right shoulder touching the door. He was unresponsive, cold to the touch and stiffening.

The distraught assistant called 911 and sheriff's deputies arrived with Tiburon and Southern Marin firefighters. Williams was pronounced dead at 12:02 p.m.


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Investigators found a closed pocket knife near the body and superficial slash marks inside Williams' left wrist. The blade had a dry red substance on it, and authorities are testing it to confirm whether it is Williams' blood.

Boyd declined to release additional details about the scene and would not comment on whether a suicide note was found.

The investigation is continuing but the coroner's division found no signs of a struggle suggesting foul play.