Robin Williams May Have Had Dementia-Linked Hallucinations Before Suicide

New details emerge from the comedian's autopsy report that may help explain his death.
1:57 | 11/12/14

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Transcript for Robin Williams May Have Had Dementia-Linked Hallucinations Before Suicide
Turn now to new details about the death of robin Williams. A report reveals he may have been suffering from dementia that can cause hallucinations. Mara schiavocampo has the story. Reporter: ABC news obtain, an autopsy report revealing the comedian may have had a condition, Louis body dementia, linked to hallucinations and unusual behaviors. And diagnosed with parkinsons disease last November. The pathological line is a blurry line. Reporter: According to the coroner's report, he was having a hard time sleeping and was restless. And the night before his body was discovered, acting strangely and reportedly placed several wristwatches in a sock. Giving them to an undisclosed person as he was worried about the watches and wanted to keep them safe. It's most often confirmed after death when looking at a person's brain tissue through a microscope. It can include unusual behaviors, trouble sleeping and visual hallucinations of animals or people. As well as slowed movement similar to parkinsons. He had multiple medications before his death, some that doctors say can exacerbate symptoms. He battled alcohol, drug addiction and depression. There's a voice that goes -- yeah. Reporter: Though no alcohol in the system when he died, he may have been in a fragile mental state. Some reveal if this condition could have played a role too. Sources close to the Williams family telling ABC news correlation doesn't necessarily equal causation, but it was illuminating. For "Good morning America," Mara schiavocampo, ABC news, new York.

This transcript has been automatically generated and may not be 100% accurate.

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