Image: File photo of Robin Williams (© JB Lacroix/WireImage)

Oscar-winning actor and comedian Robin Williams apparently took his own life at his Northern California home Monday, law enforcement officials said. Williams was 63.

"He has been battling severe depression of late," his media representative Mara Buxbaum said.

Coroner investigators suspect "the death to be a suicide due to asphyxia," according to a statement from the Marin County, California, Sheriff's office.

Marin County deputies responded to an emergency call from Williams' home in unincorporated Tiburon, California, at 11:55 a.m., reporting "a male adult had been located unconscious and not breathing," the release from the sheriff said.

Williams was pronounced dead at 12:02 p.m., it said.

Williams was last seen alive at his home, where he lives with his wife, at about 10 a.m., the sheriff's statement said.

An autopsy is scheduled for Tuesday, the sheriff said.

Williams made at least two trips to rehab for drug treatment, including a visit this summer.