American actor and comedian Robin Williams was found dead, aged 63, in an apparent suicide.
He was found unconscious and not breathing at his home near Tiburon, north of San Francisco.
He was pronounced dead at his home shortly after Marin County Police in California responded to an emergency call around noon local time.
Williams' struggles with alcohol and drugs were well-known, as he had often talked and joked about them.
Marin County's assistant chief deputy coroner, Keith Boyd, told a news conference that Williams' personal assistant found him suspended from a belt wedged between a closet door and a door frame, in a seated position just off the ground.
"Mr. Williams' personal assistant became concerned at approximately 11:45 a.m. when he failed to respond to knocks on his bedroom door.
"His right shoulder area was touching the door with his body perpendicular to the door and slightly suspended. Mr. Williams at that time was cool to the touch with rigor mortis present in his body."
Boyd did not say whether Williams left a suicide note, nor if any drugs or alcohol were involved.
Williams tragic end has shocked his fans worldwide particularly because many of the on-screen characters he portrayed were so full of life and vitality.