Robin Williams’ Cause of Death: The Full Story Behind His Final Days

When a comedian who spent decades making the world laugh dies by suicide, the silence that follows is jarring. Robin Williams’ death in 2014 wasn’t just a loss of a Hollywood star — it was the end of a private war against conditions far more complex than audiences ever knew, and the official report cites suicide by asphyxiation, but the medical story behind that finding is one of a brain under siege from Parkinson’s disease, depression, and an undiagnosed neurological condition that would only be revealed after his death.

Born: July 21, 1951 ·
Died: August 11, 2014 ·
Cause of death: Suicide by asphyxiation ·
Diagnosed with: Parkinson’s disease, depression, anxiety ·
Net worth: $50 million

Six facts that frame the life behind the headlines: from birth in Chicago to the posthumous medical discovery that changed how we understand his death.

What was the cause of Robin Williams’ death?

The Marin County coroner ruled Williams’s death a suicide by hanging, with no alcohol or illegal drugs in his system — only therapeutic levels of prescribed medications (CNN report). The official cause was asphyxiation, but the context was a man battling multiple health crises behind closed doors.

Was Robin Williams sober when he died?

• Toxicology tests showed no alcohol or illegal substances (USA Today)
• Only therapeutic levels of prescription medications were detected (USA Today)

The implication: sobriety wasn’t the issue. His body was chemically clean, which makes the neurological and psychological burden even more stark.

How was Robin Williams found when he died?

• He was discovered by his assistant at his home in Tiburon, California (CNN)
• He had been sleeping in a stepson’s room due to insomnia and anxiety linked to his Parkinson’s diagnosis (CNN)

The pattern: his final days were marked by such severe restlessness and paranoia that he couldn’t even sleep in his own bed.

Who found Robin Williams’ death?

• His longtime assistant found him (CNN)

What was Robin Williams diagnosed with?

Williams received a Parkinson’s disease diagnosis in November 2013 (CNN). But the full medical picture was far more layered, as revealed after his death.

Three conditions, one devastating convergence: the diagnoses that defined his final year.

Why this matters: His widow, Susan Schneider, later told The Guardian that “it was not depression that killed Robin” — but a neurological storm that mimicked psychiatric illness.

What is Parkinson’s disease?

• A progressive neurological disorder affecting movement, often accompanied by depression and anxiety (Parkinson’s Foundation)
• The Parkinson’s Foundation notes that people with Parkinson’s are at higher risk for suicide

Did Robin Williams have depression?

• Yes, he experienced severe depression and anxiety, including paranoia and insomnia before his death (CNN)

What was Robin Williams’ dark past?

Behind the comic genius were decades of addiction, failed relationships, and psychological battles that shaped — and sometimes threatened — his life.

Why did Robin Williams’ wife leave him?

• He had a highly publicized divorce from first wife Valerie Velardi, though the claim that his wife left him is a misunderstanding — he was married to Susan Schneider at death (CNN)

Did Robin Williams have substance abuse issues?

• He had a history of cocaine and alcohol abuse, which he openly discussed in interviews
• He struggled with depression and anxiety throughout his life (CNN)

The catch: his sobriety at death — clean toxicology — suggests the final demon wasn’t addiction but something deeper and less understood.

Who did Robin Williams leave his money to when he died?

His estate was valued at around $50 million, distributed among his three children — Zelda, Cody, Zachary — and his widow Susan Schneider, with provisions managed through a trust.

What was Robin Williams’ net worth?

• Estimated at $50 million at death

The implication: his wealth couldn’t shield him from the biological realities of his conditions.

What were Robin Williams’ last words before he died?

His last words were reportedly to his wife, “Goodnight, my love.” He also sent a text message to his daughter Zelda. The exact content of the text has not been publicly confirmed.

“It was not depression that killed Robin.”

— Susan Schneider Williams, widow, to The Guardian

“The coroner’s findings said Williams had experienced paranoia, insomnia, and anxiety before his death.”

— CNN report on the official autopsy

“There were so many misunderstandings about what had happened to him.”

— Susan Schneider Williams, to The Guardian, 2021

The pattern that emerges is not of a comedian beaten by depression alone, but of a man whose brain was dismantling itself from within. For anyone carrying the burden of a neurological diagnosis, the warning is clear: the real enemy may not be the disease you know about, but the one that hasn’t been diagnosed yet. For researchers and clinicians, the legacy of Robin Williams is a call to look deeper — because sometimes what looks like depression is actually dementia.

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