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Robin Williams’s wife states that he was suffering from the early stages of Parkinson's disease at the time of his death.
Susan Schneider said her husband had been sober but "not yet ready to share publicly" his struggles with Parkinson's.
She added that he had also been suffering from anxiety and depression.
The 63-year-old actor was found dead in an apparent suicide in his home on Monday.
Williams was famous for films such as Good Morning Vietnam and The Fisher King, and won an Oscar for his role in Good Will Hunting.