By Nicole Sperling
Updated August 12, 2014 at 07:05 PM EDT

At a press conference held Tuesday morning in Marin County, the assistant deputy chief coroner Keith Boyd said that initial findings suggest Robin Williams death was a suicide by hanging.

He was found in his bedroom with a belt around his neck and acute slash marks on his left wrist.

According to Boyd, Williams was last seen alive Sunday evening at 10:30 when his wife, Susan Schneider, retired for the night. She then left the house Monday morning at 10:30 a.m., assuming that Williams was still sleeping. Williams’ personal assistant became concerned later that morning when he didn’t respond to knocks on the bedroom door. The aide gained entry to the room and found the body and immediately called 911.

According to Boyd, Williams’ body was found slightly suspended, in a seated position, from a belt secured between the door and the frame. Next to the body was a pocket knife with what appeared to be Williams’ blood on it. Though the coroner wouldn’t speculate on time of death, rigor mortis had already set in.

A full toxicology report will be conducted and the official results of the investigation will be released in the next two to six weeks.

Since Williams’ death yesterday, there has been a tremendous outpouring of remembrances and tributes for the man who brought joy and laughter to audiences around the world. Williams battled depression and substance abuse for decades. He most recently sought rehab in July.