Investigators believe Williams, 63, used a belt to hang himself from a bedroom door sometime between late Sunday and when his personal assistant found him just before noon Monday, according to Marin County Assistant Deputy Chief Coroner Lt. Keith Boyd.
Boyd would not confirm or deny whether Williams left behind a letter, saying that investigatorswould discuss "the note or a note" later.
The autopsy completed Tuesday morning showed "no indication of a struggle or physical altercation," which was consistent with the death being a suicide, Boyd said.
The personal assistant found Williams "clothed in a seated position, unresponsive, and with a belt secured around his neck with the other end of the belt wedged between the closed closet door and door frame," he said.
Williams' left wrist had cuts when he was found dead in a bedroom at his home, Boyd said. A pocket knife was found near his body, and a red material consistent with dried blood was found on the knife, Boyd said. He said tests will be conducted to determine whether the substance is blood.
Williams was last seen alive at about 10:30 p.m. Sunday, by his wife, when she went to bed, Boyd said. He apparently went into a bedroom at an unknown time after that, and his wife left the home at about 10:30 a.m. Monday, believing him to be asleep.
Williams' personal assistant, concerned because he wasn't responding to knocks on his door, entered the room and found him dead at about 11:45 a.m., Boyd said.