It’s not common, but he was an offensive lineman, and they’re absolutely huge.
Which puts a serious strain on the heart. Add to that the diets these guys use to maintain that weight. The center for my HS football team died young. I honestly can't recall his exact age.
I had a friend who was a D-1 lineman who died from a heart attack when he was 25.
“It’s not common, but he was an offensive lineman, and they’re absolutely huge.”
In fact, coronary heart disease is the 7th leading cause of death for males in that age group (https://freerepublic.com/perl/post?id=4055819%2C3). But why let science and statistics get in the way of a good conspiracy. Throw in the size of a typical lineman and possible use of steroids (or other illegal drugs), death by heart attack is not that unusual at that age.