Sheriff's Investigators say the coroner's office believes his death was a suicide.
His death was reported to emergency dispatchers around 11:55 a.m. on Monday morning.
Law enforcement and fire officials responded to his home in Tiburon, Calif.
Their preliminary investigation indicates that he was asphyxiated.
They are still investigating the incident, however.
The Sheriff's Office says he was last seen alive around 10 p.m. on Sunday night.
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