Robin Williams had a common but difficult to diagnose condition known as Lewy Body Dementia and this may have contributed to his decision to commit suicide last August, according to documents included in his autopsy report.

The coroner in San Rafael, California, released its autopsy report as well as a pathology report from the University of California San Francisco documenting the comedian’s condition. All people with LBD have dementia, and sometimes appear confused and disoriented and exhibit unusual behavior, said Angela Taylor, the director of programming for the Lewy Body Dementia Association.

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