Actor Robin Williams has died from a suspected suicide, the Marin County Sheriff’s Office in California confirmed Monday.
He was found unresponsive just before noon inside his residence in unincorporated Tiburon, California.
He was pronounced dead at his home a short time later.
An investigation into the cause, manner, and circumstances of the death is currently underway by the Investigations and Coroner Divisions of the Marin County Sheriff’s Office.
"At this time, the Sheriff’s Office Coroner Division suspects the death to be a suicide due to asphyxia, but a comprehensive investigation must be completed before a final determination is made."
An autopsy is scheduled for Tuesday, with subsequent toxicology testing to be conducted.
Robin McLaurin Williams was 63.He had been battling severe depression recently, according to Mara Buxbaum, his press representative.
He was last seen alive at about 10 p.m. Sunday.
"This morning I lost my husband and best friend, while the world lost one of its most beloved artists and beautiful human beings. I am utterly heartbroken," Williams's wife, Susan Schneider, said in a statement.
Robin Williams was like no other ..To watch him create on the spot was a privilege to behold.. Robin you are an angel now !!! REST IN PEACE— Henry Winkler (@hwinkler4real) August 11, 2014
Mork & Mindy co-star Pam Dawber issued a short statement: "I am completely and totally devastated, What more can be said?"
Sally Field, who was Williams' co-star in "Mrs. Doubtfire" also released a statement on his death.
"I feel stunned and so sad about Robin. I'm sad for the world of comedy. And so very sad for his family. And I'm sad for Robin. He always lit up when he was able to make people laugh, and he made them laugh his whole life long.... tirelessly. He was one of a kind. There will not be another. Please God, let him now rest in peace."
Williams' publicist, Mara Buxbaum, released a statement that said, "This is a tragic and sudden loss. The family respectfully asks for their privacy as they grieve during this very difficult time."
"Robin Williams was an airman, a doctor, a genie, a nanny, a president, a professor, a bangarang Peter Pan, and everything in between. But he was one of a kind. He arrived in our lives as an alien - but he ended up touching every element of the human spirit. He made us laugh. He made us cry. He gave his immeasurable talent freely and generously to those who needed it most -- from our troops stationed abroad to the marginalized on our own streets," President Barack Obama said in a statement.
He was well known as a stand-up comedian when he starred in the TV series "Mork & Mindy," playing an alien who comes to Earth from the planet Ork and lands in Boulder, Colorado. The series ran from 1978 to 1982 on ABC. His own series came about after Williams appeared as the same character in "Happy Days."
The Mork & Mindy show supposedly took place at Mindy's home in Boulder. Exteriors were shot at 1619 Pine Street, just north of downtown Boulder. The 130-year-old house is one of the top tourist attractions in Boulder.
Other Boulder-area scenes appeared in the show’s opening sequence, including Mindy driving her Jeep down Boulder Canyon, Pearl Street where Mindy’s father Fred had his music store and Mork and Mindy at Boulder Falls and Folsom Field.
Williams won an Academy Award for Best Supporting Actor for his portrayal of an empathetic therapist in the 1977 movie "Good Will Hunting." He and Bette Midler were Johnny Carson's final guest in 1992 when Carson signed off from "The Tonight Show."
Images: Remembering Robin Williams
His personal life was often short on laughter. He had acknowledged drug and alcohol problems in the 1970s and `80s and was among the last to see John Belushi before the "Saturday Night Live" star died of a drug overdose in 1982.
Williams announced in recent years that he was again drinking but rebounded well enough to joke about it during a recent tour. "I went to rehab in wine country," he said, "to keep my options open."
"You look at the world and see how scary it can be sometimes and still try to deal with the fear," he told the AP in 1989. "Comedy can deal with the fear and still not paralyze you or tell you that it's going away. You say, OK, you got certain choices here, you can laugh at them and then once you've laughed at them and you have expunged the demon, now you can deal with them. That's what I do when I do my act."
Celebrities, fans mourn Robin Williams on social media: