My recollection is that his general health was quite poor and he also had a documented history of not following doctors' orders. Of course it's also probably n

My recollection is that his general health was quite poor and he also had a documented history of not following doctors' orders. Of course it's also probably not unrelated that he paralyzed someone for life in a stabbing attack many years ago, but I believe the official story at least was that this didn't enter into the calculus.