I believe he was in a car accident in the 80's and had some brain damage.
My understanding is that he had stopped cruising to finish his book in the 1980's, and a year after he finished it he had an accident. Some kind of head trauma. He never sailed again and had to move in with his parents so they could care for him.
Thank you, I hadn't heard. Always a sad thing, glad he had family to care for him. We are actually very fragile, amazing we last as long as we do.