Officials: Robin Williams apparently hanged himself with a belt --- (CNN) -- The tributes to Robin Williams flow from around the world as stunned friends and family search for answers about why the comic legend would take his own life. -- 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 at his home in California, 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 investigators would discuss "the note or a note" later. -- The coroner's investigation "revealed he had been seeking treatment for depression," Boyd told reporters. -- "He has been battling severe depression of late," Williams' media representative, Mara Buxbaum, told CNN on Monday. "This is a tragic and sudden loss." -- 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, 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. His wife left the home at about 10:30 a.m. Monday, assuming Williams was still 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. - Read More, http://www.cnn.com/2014/08/12/showbiz/robin-williams-dead/index.html?hpt=hp_t1