Robin Williams was declared dead on Aug. 11, notes Marin County Communications.

Before noon, someone called 911 after finding him unconscious in his home. The cause of death is not yet known, but it is suspected to be a suicide due to asphyxia, according to the Marin Sheriff's Department. The actor was 63.

His publicist wouldn't confirm it was a suicide, but a rep did release a statement.

"Robin Williams passed away this morning. He has been battling severe depression of late. This is a tragic and sudden loss," the rep said. "The family respectfully asks for their privacy as they grieve during this very difficult time."

In July, it was announced that Williams had checked into rehab.

He had checked into the Hazelden Addiction Treatment Center in Lindstrom, Minnesota. TMZ reported that it was to help him maintain his sobriety.

"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," said Williams' rep to TMZ.

Williams had struggled with alcohol and drug abuse in the 1980s. After the birth of his son, he was sober for 20 years, but then he relapsed. In 2006, he went to rehab.

Williams' wife also released a statement.

"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 the focus will not be on Robin's death, but on the countless moments of joy and laughter he gave to millions."

A forensic examination is scheduled for Aug. 12, notes the Washington Post.

William was born on July 21, 1951 in Chicago. He starred in "Hook," "Dead Poets Society" and "Aladdin." He won an Oscar for Best Supporting Actor for "Good Will Hunting."