Well, a good number of people do die after heart surgery, and being 82 years old doesn’t help. Also, as far as I know, he didn’t have any connection to Hillary, so that typical cause of usual demise is not a factor.
Probably just crappy medical care, at most, coupled with age.
Bill Paxton died after heart surgery and IIRC he was around 60. Serious surgeries sometimes have serious complications. I am sad to see malpractice if there wasn’t incompetence or malfeasance. As I won’t go to the New York Slimes, I am unclear if either of these incidents were present.