UPDATE: A coroner's report has confirmed that Robin Williams took his own life.
According to a press conference held by the Marin County police on Tuesday, the much-loved star was found in his bedroom on Monday morning by his assistant, who called 911.
“Mr. Williams’ personal assistant became concerned at approximately 11:45 am when he failed to respond to knocks on his bedroom door,” said Marin County’s assistant chief deputy coroner, Keith Boyd.
The actor was pronounced dead at 12:02 pm.
Toxicology tests will be conducted and an official press conference will follow when the autopsy is complete, which could take two to six weeks.
Robin's publicist has confirmed that the star had been struggling with severe depression, releasing the following statement:
“Robin Williams passed away this morning. 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.”
Robin's wife Susan Schneider was the last person to see the Oscar-winning actor on Sunday evening. She released the following statement to the New York Times:
"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. On behalf of Robin's family, we are asking for privacy during our time of profound grief. As he is remembered, it is our hope that the focus will not be on Robin's death but on the countless moments of joy and laughter he gave to millions."
Robin's wife Susan Schneiderhas said she is "utterly heartbroken"
The star checked into rehab in June to help him maintain his sobriety, his spokesperson said at the time.
The comedian, who has been candid about his battle with alcohol and substance abuse in the past, checked into a treatment facility to "focus on his commitment" to overcome his addictions.
"After working back-to-back projects, Robin is simply taking the opportunity to fine-tune and focus on his continued commitment, of which he remains extremely proud," his rep said.
Robin began his career as a stand-up comedian, but went on to become a celebrated film actor who excelled in both comedic and dramatic roles. Some of his most memorable films include Mrs. Doubtfire, Jumanji, Aladdin and Hook.
In 1998, Robin won an Academy Award for Best Supporting Actor for his role in Good Will Hunting.
He is survived by his three children: Zachary Pym, 31, Zelda Rae, 25, and 23-year-old Cody Alan Williams.