He shot himself in the chest, just like Dave Duerson who DID have significant brain trauma resulting from multiple concussions.
When I was in college I actually considered playing football but the more I thought about it the less I wanted to. I spoke with one of the coaches who said "Do you understand what you are getting into? Come a watch a few practices." The practices weren't that bad but the games!!! I was a Math/Physics major and couldn't imagine studying afterwards.
I shall quench my thirst with the blood of my enemies!