During his career, he suffered substance abuse issues and instances of severe depression. Williams was found dead at his home in Paradise Cay, California, in August 2014, at age 63. His death was ruled a suicide. According to his widow, he had been diagnosed with Parkinson's disease, and had been experiencing depression, anxiety and increasing paranoia. His autopsy found "diffuse Lewy body disease", and Lewy body dementia professionals said that his symptoms were consistent with dementia with Lewy bodies.