After any kind of surgery, they always give you a shot to prevent blood clots..that is what they did for my cousin after he had knee surgery I think they give the shot in your stomach and also give blood clotting medication. Very sad, Hall went through a lot in his life, drug addiction, etc..just to end up dying from a blood clot after surgery and not even right after surgery, a week later
Drug addiction does a number on heart tissue. I would bet there were years of steroid use as well. That kiss the heart as well.
He seemed like a talented guy. I hate seeing people his age pass.