According to the Hollywood Reporter, Williams was found unconscious inside his home in Tiburon, California. Marin County Communications received a 911 call and responding emergency personnel found him around noon on Monday, Aug. 11.
Williams was last seen alive at his home, where he lives with his wife, around 10 p.m. Sunday night. He had checked into rehab back in July, but his progress had not been made public.
"Robin Williams passed away this morning," Williams' rep confirmed. "He has been battling severe depression of late. This is a tragic and sudden loss. The family respectfully asks for their privacy as they grieve during this very difficult time."
Williams' wife also released a statement to NBC News, saying, "This morning, I lost my husband and my best friend, while the world lost one of its most beloved artists and beautiful human beings. I am utterly heartbroken."
The legendary actor was born in 1951 in Chicago and started his career as a comedian. He made his mark in Hollywood at a young age — notably as Mork on the show, Mork & Mindy. His memorable roles may be too many to name, but he appeared over decades in films like Good Morning, Vietnam, Dead Poets Society, Mrs. Doubtfire, The Birdcage, Good Will Hunting and as the voice of the genie on Aladdin. He most recently returned to TV, along with Sarah Michelle Gellar, in The Crazy Ones.
Williams won an Oscar in 1998 for his role on Good Will Hunting, but he was also nominated in 1988, 1990 and 1992.
He had been filming Night at the Museum: Secret of the Tomb, but it's not clear if his part was all filmed. Mrs. Doubtfire 2 had been announced, but the future of the film is now in question.
"There really are no words to describe the loss of Robin Williams," Fox, which is producing the Night at the Museum sequel, said in a statement. "He was immensely talented, a cherished member of our community, and part of the Fox family. Our hearts go out to his family, friends and fans. He will be deeply missed."
According to a release by the Marin County Sheriff’s Office, the initial cause of death appears to be suicide by asphyxia, but the Investigations and Coroner Division of the Marin County Sheriff's Office is currently investigating the circumstances and cause of death.
UPDATE Aug. 12, 2014: The Marin County Sherrif's office has confirmed the coroner's finding that Williams died of suicide by asphyxia due to hanging. They have refused to confirm the presence of a note.
If you suspect someone might be considering suicide, or you have struggled with those thoughts yourself, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).
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