SOURCE: ST COMMUNITIES
Actor Robin Williams suffered from Lewy body dementia, and that led to his suicide in August, according to reports.
A few days after his death, his wife had said the star was suffering from depression and the early stages of Parkinson's disease.
But a redacted pathology report from the autopsy on his body also mentions Lewy body disease, a progressive form of dementia with symptoms similar to Parkinson's disease, said USA Today.
The report obtained by the media states that Williams had the brain disease "diffuse Lewy body dementia" with symptoms such as visual halluncinations, fluctuating consciousness or attention, slowness of movement and depression.
It is caused by lewy bodies or abnormal protein in nerve cells that disrupt normal function.
Website TMZ on Tuesday cited sources connected with the Williams family as saying "Lewy Body dementia was the 'key factor' they believe drove him to kill himself. We're told Robin's doctors agree that the disease was the critical factor leading to his suicide."
People afflicted by Parkinsonism and Lewy body disease often get severe side effects from Parkinson's medications, it added.
Coroners had found that Williams, 63, had died from "asphyxia due to hanging" and had increasingly become paranoid when he committed suicide.
Radio legend Casey Kasem, who died last June, also suffered from Lewy body disease and Parkinsonism.