I don’t think there was foul play, but there should have been an autopsy to move the certainty to 100% for all who aren’t sold on the idea.
Perhaps, but some families are adamantly against the conduct of an autopsy, for religious and other reasons, in the absence of objectively suspect circumstances. I’m willing to bet that Scalia’s family and close friends knew he had seriousness health problems and was living on borrowed, and that his sudden death came as no surprise.
Do you really think an autopsy would have satisfied them?
If he'd died in a hospital bed, I wouldn't expect an autopsy. But he died alone, away from his family, and declared dead by natural causes through a phone call to his personal doctor. If I was a family member, I'd most definitely want to know what finally took him from us.