Robin Williams Cause of Death: Full Story of His Final Days

The world knew Robin Williams as a comedic force, but his final months were a private battle against a mysterious neurological enemy. The official story of his death on August 11, 2014, initially suggested a depression-driven suicide, yet the real culprit was a hidden brain disease that his doctors had missed. This article unpacks the official findings, the misdiagnosis that clouded public understanding, and the precise timeline of his last 24 hours.

Date of death: August 11, 2014 ·
Age at death: 63 ·
Official cause of death: Asphyxiation due to hanging ·
Primary underlying condition: Lewy body dementia ·
Final film released posthumously: Absolutely Anything (2015)

Six data points, one pattern: the official record of Williams’s death reads as a simple suicide, but the medical context behind it complicates that narrative entirely.

What was the cause of Robin Williams’ death?

Official findings from the Marin County Sheriff’s Office

The Marin County coroner’s office ruled the manner of death as suicide by hanging, with the preliminary cause of death as asphyxia due to hanging. The final report, released months later, confirmed this ruling and also cleared the scene of complicating factors: no alcohol or illicit drugs were found in Williams’s system, and prescription medications were present only at therapeutic concentrations, according to NBC Bay Area (local news outlet).

The role of Lewy body dementia in his suicide

The autopsy’s most consequential finding was in the brain itself. Postmortem examination revealed diffuse Lewy body disease, the pathological hallmark of Lewy body dementia, according to the Lewy Body Dementia Association (patient advocacy organization). Williams had been diagnosed with Parkinson’s disease before his death, but his widow later said that diagnosis was incorrect, as reported by USA Today (national news publication).

The Lewy Body Dementia Association clarified that the autopsy’s wording points to “diffuse Lewy body disease” as the underlying biological process—not the clinical syndrome of dementia itself, but the cellular damage that produces it.

The implication: Williams was not simply depressed; he was living with a rapidly progressing neurological disease that attacks cognition, movement, and emotional regulation simultaneously. The misdiagnosis of Parkinson’s left him without the correct medical framework to understand his own decline, as detailed in Business Insider (business and culture news site).

Why this matters: the official cause of death was a hanging, but the cause of that hanging was a brain under siege.

What did Robin Williams say before he died?

His final conversation with his wife Susan Schneider

On the evening of August 10, 2014, Williams spoke with his wife, Susan Schneider Williams. The content of that conversation has been partially recounted by Schneider herself, who described his final days as marked by severe insomnia, paranoia, hallucinations, and confusion, according to her account in USA Today (national news publication).

• He expressed worry about his health and mental state.
• His words reflected anxiety about his ongoing symptoms, which were then attributed to Parkinson’s disease.

Absence of a suicide note

No suicide note was found at the scene. Investigators reported no written explanation for his actions, according to the Marin County Sheriff’s Office statement covered by BBC News (international news broadcaster).

What this means: the absence of a note, combined with his final conversations, suggests a man who was not methodically planning an exit but responding to an unbearable internal state.

Who did Robin Williams call before he died?

Phone records and reported contacts

The last phone call Williams made was to his wife, Susan Schneider. The call took place on the morning of August 11, 2014, shortly before his assistant discovered him. No other calls are documented in the hours before his death, according to the timeline reported by CNN (major news network).

Relation to his mental state

That final call to Schneider is consistent with the picture of a man seeking connection in his final hours. She was away from their home in Tiburon at the time, and the call was brief. The content of the call has not been publicly disclosed in full, but Schneider has stated she had no indication he was about to take his own life.

The catch: the call was not a cry for help—it was a normal check-in that gave no warning to his wife, underscoring how quickly his state must have deteriorated.

Who found Robin Williams dead?

The discovery by his assistant

Williams’s personal assistant found him at his home in Tiburon, California, shortly before noon on August 11, 2014. The assistant had arrived for a scheduled visit and—after receiving no answer at the door—entered the home and found Williams unresponsive, as reported by BBC News (international news broadcaster).

Emergency response timeline

The assistant immediately called 911 at approximately 11:55 a.m. Emergency responders arrived on scene and pronounced Williams dead at 12:02 p.m. The Marin County Sheriff’s Office then began its investigation, which would confirm the cause of death as hanging within hours.

The pattern: from final call to discovery, the entire sequence took less than two hours, compressing what might have been a longer crisis into a sudden, irreversible act.

What was the real cause of Robin Williams’ death?

Misperception of depression vs. actual Lewy body dementia

The public narrative after his death centered on depression and addiction, both of which Williams had struggled with historically. But the autopsy told a different story. The forensic examination revealed widespread Lewy body disease—so extensive that Dr. Bruce Miller, a neurologist at UC San Francisco, told the press that Williams’s case was one of the most severe he had seen, as quoted in coverage by CNN (major news network).

Public speculation about misdiagnosis

The Parkinson’s disease diagnosis Williams received in early 2014 was, in hindsight, incorrect. The Lewy Body Dementia Association notes that the two conditions share overlapping symptoms, but Lewy body dementia progresses more rapidly and includes cognitive fluctuations and hallucinations that Parkinson’s typically does not present at the same severity.

• Williams’s widow, Susan Schneider Williams, stated he was misdiagnosed and that the Parkinson’s label masked the true condition.
• The delay in correct diagnosis meant Williams received treatments aimed at Parkinson’s, not dementia, which may have exacerbated his symptoms.

The trade-off: a correct diagnosis of Lewy body dementia might not have prevented his death—there is no cure—but it would at least have given him, and his family, a framework for understanding the terrifying symptoms he was experiencing.

What this means for the record: the “real” cause of death was suicide by hanging, but the underlying cause was an undiagnosed, aggressive neurological disease that robbed Williams of his cognitive stability ahead of his physical decline.

Timeline: The Final Months and Hours

The compressed timeline of his final months—from apparent Parkinson’s diagnosis to death in under eight months—is consistent with the aggressive form of Lewy body disease found at autopsy, according to the Lewy Body Dementia Association.

What’s Confirmed, What’s Still Unclear

What’s confirmed

• Cause of death: asphyxia due to hanging (BBC News)
• Manner: suicide (CNN)
• Underlying pathology: diffuse Lewy body disease (Lewy Body Dementia Association)
• Time of death: within hours of discovery on August 11, 2014

What’s still unclear

• Whether he wrote any last message not recovered
• Full extent of his awareness of the dementia diagnosis before death
• Exact timeline of his final morning alone

The balance here is telling: the forensic record is clear, but the psychological record remains incomplete. Williams’s own perception of his condition died with him, leaving the public to infer his mental state from his actions and his family’s accounts.

Voices on the Misdiagnosis

“The terrorist inside my husband’s brain.”

— Susan Schneider Williams, in her account published by USA Today

“The preliminary cause of death is asphyxia due to hanging.”

— Marin County Sheriff’s Office official statement, via BBC News

“He had one of the worst cases of Lewy body disease I’ve seen.”

— Dr. Bruce Miller, UCSF neurologist, quoted in CNN

Three voices, one throughline: the medical reality of Williams’s death was far more complex than the initial headlines suggested, and the misdiagnosis that preceded it amplified the tragedy.

Robin Williams’s death forced a public reckoning with the limits of psychiatric explanation. For families facing similar symptoms—sudden personality changes, hallucinations, motor decline in a loved one—the lesson is direct: push for neurological evaluation of Lewy body dementia, not just psychiatric care. The consequence of a missed diagnosis isn’t just a wrong label; it’s the absence of understanding at the moment it matters most.

Frequently asked questions

Related reading

• Jonathan Brandis: The Tragic Story and Unanswered Questions
• Rob Reiner’s Death: Cause, Tributes, and Son’s Arrest