63-year-old Williams recently checked into a renewal centre in an effort to maintain his sobriety. He has been battling severe depression of late.
The local coroner suspects the death to be a suicide due to asphyxia, but a comprehensive investigation must be completed before a final determination is made.
"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."
Williams won a supporting actor Oscar for Good Will Hunting. He had been a prominent fixture on screens since the 1970s where he has portrayed a wide variety of characters.
He earned Oscar nominations for Best Actor for his varied roles in Good Morning, Vietnam, The Fisher King and Dead Poets Society, and will always be remembered for his title role in Mrs.Doubtfire from 1993.
He won four Grammy Awards and two Emmys.