OK, some essential background info...from Wikipedia...
"His publicist Mara Buxbaum commented that he was suffering from severe depression prior to his death.[135] His wife Susan Schneider stated that in the period before his death, Williams had been sober, but was diagnosed with early stage Parkinson's disease, which was information he was "not yet ready to share publicly."[136][137] An autopsy revealed that Williams had been suffering from Lewy body dementia, which had been misdiagnosed as Parkinson's. This may have contributed to his depression.[136][138][139]
In an essay published in the journal Neurology two years after his death, Susan Schneider revealed that the pathology of Lewy body dementia in Williams was described by several doctors as among the worst pathologies they had seen. She described the early symptoms of his disease as beginning in October 2013. It included a sudden and prolonged spike in fear and anxiety, constipation, urinary difficulty, heartburn, sleeplessness and insomnia, a poor sense of smell, stress, and a slight tremor in his left hand. Eventually, she said, he suffered from paranoia, delusions, severe insomnia, memory loss, and high cortisol levels, indicating stress. According to Schneider, "Robin was losing his mind and he was aware of it ... He kept saying, 'I just want to reboot my brain.'"[9]
Death
On August 11, 2014, Williams committed suicide at his home in Paradise Cay, California, at the age of 63.[8] In the initial report released on August 12, the Marin County Sheriff's Office deputy coroner stated Williams had hanged himself with a belt and died from asphyxiation.[140][141][142] The final autopsy report, released in November 2014, affirmed that Williams had committed suicide as initially described; neither alcohol nor illegal drugs were involved, while all prescription drugs present in his body were at "therapeutic" levels. The report also noted that Williams had been suffering "a recent increase in paranoia".[143] An examination of his brain tissue revealed the presence of "diffuse Lewy body dementia", which had been misdiagnosed as Parkinson's disease.[138] Describing the disease as "the terrorist inside my husband's brain", his wife Susan Schneider stated that "however you look at it—the presence of Lewy bodies took his life."
