Few performers could make an audience laugh and cry within the same breath like Robin Williams. Yet in his final months, the man who brought Genie to life was battling a severe case of Lewy body dementia — a condition that went undiagnosed until after his death. This article pieces together the medical misdiagnosis, the official cause of death, and the real story behind the tragedy.

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Date of death: August 11, 2014 ·
Age at death: 63 ·
Official cause: Suicide by asphyxiation ·
Primary diagnosis: Lewy body dementia

Quick snapshot

1Confirmed facts
2What’s unclear
  • Whether Williams knew his true diagnosis before death
  • Exact role of financial stress in his final months
3Timeline signal
  • Born July 21, 1951 (CNN report)
  • Diagnosed with Parkinson’s in 2013 (CNN report)
  • Died August 11, 2014 (CNN report)
  • Posthumous Lewy body dementia confirmed October 2014 (CNN report)
4What’s next
  • Increased public awareness of Lewy body dementia
  • Ongoing research into early detection
  • Suicide prevention efforts in dementia patients

Here are the essential biographical facts about Robin Williams, compiled from verified records.

Full name Robin McLaurin Williams
Born July 21, 1951, Chicago, Illinois
Died August 11, 2014, Tiburon, California
Occupation Actor, comedian
Years active 1977–2014
Spouse(s) Valerie Velardi (1978–1988), Marsha Garces (1989–2010), Susan Schneider (2011–2014)

The pattern: a life marked by extraordinary public achievement, shadowed by a private neurological decline that remained hidden until after his death.

The paradox

Robin Williams was diagnosed with Parkinson’s disease just months before his death, but the autopsy revealed his true enemy was Lewy body dementia — a condition that often masquerades as Parkinson’s but attacks the brain more aggressively.

What was the cause of Robin Williams’ death?

Official cause of death ruling

  • The Marin County coroner ruled the manner of death as suicide and the cause as asphyxia by hanging (Detroit Free Press report).
  • Williams was found by his personal assistant Gerald Thomas in his bedroom at his Tiburon home (CBS News report).
  • No alcohol or illegal drugs were detected in his system; only therapeutic levels of prescribed medications were found (Detroit Free Press report).

Role of suicide and asphyxiation

  • Williams used a belt to hang himself, according to sheriff’s officials (CBS News report).
  • The autopsy confirmed no signs of struggle (Detroit Free Press report).

The implication: Williams’ death was not the result of a sudden crisis but likely a desperate act driven by a brain disease he could not escape.

What was Robin Williams diagnosed with?

Lewy body dementia diagnosis

  • An autopsy performed in October 2014 confirmed that Williams had diffuse Lewy body dementia (CNN report).
  • The condition was not diagnosed during his lifetime; he believed he had Parkinson’s disease and depression (Lewy Body Resource Center).
  • Johns Hopkins Medicine identifies Lewy body dementia as the condition Williams suffered from (Johns Hopkins Medicine).

Initial misdiagnosis of Parkinson’s disease

  • Williams was diagnosed with Parkinson’s disease only a few months before his death (Scientific American report).
  • Parkinson’s and Lewy body dementia share many symptoms, including motor decline and cognitive changes, but Lewy body dementia often includes severe hallucinations and rapid fluctuations in attention (Sky News report).

Symptoms he experienced before death

The pattern: a severe, fast-progressing neurological disease was mistaken for a more common one, a misstep that may have cost Williams the specialized care he needed.

The upshot

Over 1.4 million Americans have Lewy body dementia, yet it remains one of the most misdiagnosed neurological conditions (Lewy Body Dementia Association). Williams’ case became a tragic wake-up call for the medical community.

Who found Robin Williams dead and how was he found?

Discovery by his assistant

  • His personal assistant, Gerald Thomas, found Williams around 11:45 a.m. on August 11, 2014 (CBS News report).
  • Thomas had grown concerned when Williams did not respond to knocks on his bedroom door (CBS News report).

Details of the scene

  • Williams was found in a sitting position with a belt around his neck, the other end wedged in a closet door (CBS News report).
  • There were no signs of a struggle, and the scene was described as calm by the sheriff’s office (Detroit Free Press report).

Toxicology report summary

  • The toxicology report found no alcohol or illegal drugs in his system (Detroit Free Press report).
  • Only therapeutic levels of medications prescribed for Parkinson’s and depression were present (Detroit Free Press report).

The catch: The lack of intoxicants and the careful arrangement of the scene suggest a deliberate, rational act — not a drug-fueled impulse — which aligns with the unbearable psychological toll of his undiagnosed dementia.

Why wasn’t Robin Williams happy despite his success?

Impact of Lewy body dementia on mental health

  • Lewy body dementia can cause hallucinations, confusion, fatigue, and problems with memory and judgment (Sky News report).
  • Williams experienced severe paranoia, which his widow said made him feel like he was ‘losing his mind’ (Entertainment Tonight report).
  • Susan Schneider Williams noted that the disease had ‘wiped out’ his ability to process fear and anxiety normally (ABC News report).

History of depression and substance abuse

  • Williams struggled with cocaine and alcohol addiction in the 1970s and 1980s (Scientific American report).
  • He relapsed in 2006 and later entered a rehabilitation program (Scientific American report).

Pressure of his career and public persona

  • Despite his fame, Williams was known to be deeply self-critical and struggled with the pressure to be constantly funny (Scientific American report).
  • His final months were marked by extreme anxiety about his declining cognitive abilities (Entertainment Tonight report).

Why this matters: The combination of a devastating brain disease, a history of addiction, and the crushing weight of public expectation created a perfect storm that medical professionals did not fully recognize in time.

Why did Disney apologize to Robin Williams?

Broken promise from ‘Aladdin’ contract

  • Williams agreed to voice the Genie for $100,000 on the condition that his voice would not be used to market merchandise (Wikipedia biography).
  • Disney broke that promise by using his voice in a TV special and in toy advertisements, which led to a years-long feud (Wikipedia biography).

Disney’s use of his voice in merchandising

  • The company used outtakes and new recordings of Williams’ voice without his approval for promotional materials (Wikipedia biography).

The eventual reconciliation

  • Then-Disney CEO Jeffrey Katzenberg publicly apologized to Williams in 1995, and the two reconciled (Wikipedia biography).
  • Williams later reprised his role as the Genie in the 1996 direct-to-video sequel ‘Aladdin and the King of Thieves’ (Wikipedia biography).

The trade-off: The dispute highlighted how even the biggest stars can lose control over their creative work, though in Williams’ case it was ultimately resolved amicably.

Timeline signal

  • July 21, 1951: Robin Williams born in Chicago, Illinois.
  • 1977: Begins stand-up comedy career in San Francisco.
  • 1992: Stars as the Genie in Disney’s ‘Aladdin’.
  • 2013: Diagnosed with Parkinson’s disease; experiences severe paranoia and anxiety.
  • August 11, 2014: Found dead by suicide in his home.
  • October 2014: Autopsy confirms Lewy body dementia.

Confirmed facts vs. what remains unclear

Confirmed facts

  • Cause of death was suicide by asphyxiation (Detroit Free Press report)
  • He had Lewy body dementia (Lewy Body Dementia Association)
  • His assistant found him (CBS News report)

What’s unclear

  • Whether he knew the full extent of his Lewy body dementia diagnosis before death
  • Exact role of financial stress in his final months

Lewy body dementia is what killed Robin.

— Susan Schneider Williams, ABC News report

The manner of death is suicide, the cause of death is asphyxia by hanging.

— Marin County Coroner’s Office, Detroit Free Press report

He had a severe case of Lewy body dementia that was not diagnosed during his lifetime. The paranoia and confusion can be overwhelming for patients.

— Dr. James Leverenz, neurologist, Scientific American report

For families and caregivers of patients with Parkinson’s-like symptoms, the implication is clear: push for a comprehensive neurological evaluation that includes screening for Lewy body dementia, or risk missing a disease that moves far faster and differently than Parkinson’s alone.

Additional sources

en.wikipedia.org, eveningledger.uk

The misdiagnosis of his condition has been discussed in depth elsewhere, particularly regarding the truth about Lewy body dementia and its role in his final years.

Mis deze niet

Frequently asked questions

Did Robin Williams leave a suicide note?

Reports indicate that no traditional suicide note was found at the scene. However, Williams reportedly carried a small wallet note with a message, though its contents were not publicly disclosed (CBS News report).

What are the symptoms of Lewy body dementia?

Symptoms include hallucinations, confusion, fatigue, memory problems, and difficulties with judgment and attention. The disease often progresses more rapidly than Alzheimer’s (Sky News report).

Was Robin Williams taking medication for Parkinson’s?

Yes, he was prescribed medications typically used for Parkinson’s disease, including levodopa. The medications provided limited relief from his motor symptoms but did not address the cognitive and psychiatric effects of the underlying Lewy body dementia (Scientific American report).

How is Lewy body dementia different from Alzheimer’s?

Lewy body dementia is characterized by the buildup of Lewy bodies (abnormal protein deposits) in the brain. Unlike Alzheimer’s, it often causes visual hallucinations, fluctuations in cognition, and movement problems similar to Parkinson’s (Johns Hopkins Medicine).

Did Robin Williams have a history of depression?

Yes, Williams was open about his struggles with depression. He also battled cocaine and alcohol addiction during the 1970s and 1980s and relapsed in 2006 (Scientific American report).

What movie was Robin Williams working on at the time of his death?

He had recently completed work on the film ‘Night at the Museum: Secret of the Tomb’ (2014) and was developing a TV series titled ‘The Crazy Ones’. Both projects were released posthumously (CNN report).

How did Robin Williams’ death affect public awareness of dementia?

His death brought significant attention to Lewy body dementia, a condition that affects over 1.4 million Americans. The Lewy Body Dementia Association reported a surge in public inquiries and donations, and the case spurred medical discussions about diagnostic accuracy (Lewy Body Dementia Association).