Now I heard there is to be a doctor's exam... My guess is it was maybe a couple of mini strokes. Sometimes folks get a warning, that it's time to go, other times it's a massive stroke and it's over. He should, and his family should just close this out, retire if he can...
Who might replace him is pretty spooky, but it's not the first time someone had to be replaced. I see his legacy as pretty bad already, why let it continue...