Had no idea who he was, but it's always a bummer when people off themselves. At least when they are, or have been, an inspiration for many.
That said, from what I was able to find on him, he had deteriorating health and was at the beginning stages of dementia or Alzheimer's. I've seen what happens to people who go there. Can't say I blame him.
____________________________Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.