Robin Williams Cause of Death: Lewy Body Dementia and Suicide

When a beloved comedian dies, the first question is always “how?” But for Robin Williams, the answer turned out to be far more complex than the public first heard. His death on August 11, 2014 was ruled a suicide by hanging, but the real story behind that tragic event is a medical and personal saga that continues to reshape how we understand neurodegenerative disease and mental health.

Date of death: August 11, 2014 ·
Age at death: 63 ·
Cause of death: Suicide by asphyxia ·
Postmortem diagnosis: Lewy body dementia ·
Years active: 1976–2014

Seven key facts about the beloved actor and comedian, drawn from official records and medical sources.

What was the cause of Robin Williams’ death?

What did the autopsy reveal?

The Marin County coroner ruled the death a suicide by asphyxia due to hanging. The autopsy report, released in November 2014, found no alcohol or illegal drugs in his system (SciELO case study from Brazilian scientific journal). Prescription medications detected were at therapeutic levels. Brain tissue examination later uncovered diffuse Lewy body dementia, a progressive neurodegenerative disorder.

What was the official cause of death on the death certificate?

According to Wikipedia encyclopedia entry, the death certificate lists the immediate cause as “asphyxia due to hanging” and the manner as “suicide.” The coroner noted that Lewy body disease was a significant contributing condition.

The implication: the medical community now recognizes that the suicide was a symptom of the disease, not a standalone act of depression.

What disease did Robin Williams get before he died?

What is Lewy body dementia?

Lewy body dementia (LBD) is a progressive brain disorder that affects thinking, memory, and motor control. Johns Hopkins Medicine (leading academic medical center) describes it as a dementia that causes hallucinations, fluctuations in alertness, and Parkinson-like movement issues. In Williams’s case, the Lewy bodies were spread diffusely throughout his brain.

How is Lewy body dementia different from Parkinson’s?

Williams was initially diagnosed with Parkinson’s disease in 2013. But Scientific American (U.S. science magazine) reported that the postmortem finding of diffuse Lewy bodies changed the diagnosis to LBD. The two conditions share motor symptoms, but LBD more severely impairs cognition and causes early hallucinations. The Lewy Body Dementia Association (nonprofit advocacy group) emphasized that LBD is “not just a motor disorder — it ravages the mind.”

Why this matters: The misdiagnosis meant Williams received treatment for Parkinson’s, but the actual underlying disease was LBD, which has a different progression and treatment approach. His widow later said the correct diagnosis would have changed his care.

What were Robin Williams’ last words to his wife?

What were his last words before he died?

According to Wikipedia encyclopedia entry, Williams’s last words to his wife, Susan Schneider, were “Goodnight, my love” spoken the night before his death. He left no suicide note.

Did he leave a suicide note?

Multiple sources, including the Wikipedia entry and the SciELO case study, confirm that no note was found. The case study notes that the absence of a note is consistent with impulsive behavior driven by neurological deterioration.

The pattern: His final interaction was tender and apparently normal, making the sudden suicide even more confusing to those who knew him.

Who found Robin Williams dead?

Where was he found?

Williams’s personal assistant discovered him in his bedroom at his home in Paradise Cay, California, around 11:45 AM on August 11, 2014 (Wikipedia entry). The assistant had arrived to check on him because he had not shown up for a scheduled errand.

What time was he discovered?

The discovery time is recorded as approximately 11:45 AM Pacific Daylight Time. The coroner later estimated the time of death as sometime during the previous night or early morning hours (SciELO case study).

The catch: The delay in discovery meant that the tragic scene was already hours old when authorities arrived.

Was Robin Williams sober when he died?

Was he on any medication at the time?

The toxicology report, detailed in the SciELO case study, found that prescription medications were present at therapeutic levels. These included drugs used to treat anxiety, depression, and Parkinson’s symptoms.

Did he relapse into drug or alcohol use?

The SciELO case study confirms that no alcohol or illegal drugs were detected. Though Williams had a history of substance abuse early in his career, he had been sober for many years at the time of his death.

The trade-off: Being sober yet still experiencing severe anxiety and paranoia from LBD is a stark illustration that the disease attacked his mental stability independent of any substance.

Timeline of Robin Williams’s Life and Death

• July 21, 1951 – Born in Chicago, Illinois (Wikipedia entry)
• 1976 – Began stand-up comedy career
• 1978–1982 – Starred in Mork & Mindy
• 1987 – Starred in Good Morning, Vietnam
• 1997 – Won Academy Award for Good Will Hunting
• 2013 – Diagnosed with Parkinson’s disease; later found to be Lewy body dementia (Scientific American)
• August 11, 2014 – Died by suicide at home (Wikipedia entry)
• November 2014 – Autopsy confirmed diffuse Lewy body dementia (SciELO)
• 2015 – Susan Schneider publicly revealed his LBD diagnosis and its role in his death (LBDA)

What’s Confirmed and What’s Unclear

What Others Said About Robin Williams’ Death

“I spent that last year of his life trying to understand what was happening. He was losing his mind. He was terrified.”

— Susan Schneider Williams, widow, in a statement to Scientific American

“Depression was not the underlying cause of Robin Williams’s suicide. Lewy body dementia was.”

— Lewy Body Dementia Association (nonprofit advocacy organization)

“At the time of his death, he had significant diffuse Lewy body pathology. This is not a disorder that presents with depression as a primary feature — it attacks the brain’s ability to think and regulate emotion.”

— Dr. Sam Gandy, neurologist at Mount Sinai, quoted in the SciELO case study

For readers interested in other complex celebrity stories, see Nipsey Hussle: Biography, Death, Last Words, and Legacy and Kevin Spacey 2025: What Happened, Career, Net Worth & TV Comeback.

The story of Robin Williams’s death forces a needed reassessment of how we understand suicide in the context of brain disease. For the millions of people affected by Lewy body dementia, the lesson is clear: early diagnosis matters, and symptoms that look like depression or anxiety may actually be signs of a neurodegenerative disorder. For anyone struggling with suicidal thoughts, the National Suicide Prevention Lifeline (988) offers free, confidential support 24/7.

För en djupare inblick i hans sista dagar och diagnos, se Robin Williams Todesursache.

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