9. Howard Glenn
Howard Glenn was an American football player for the AFL. He joined the AFL's New York Titans in 1960 are a starting offensive guard.
Glenn stands as the only player to die from injuries that were sustained during a normal season football game.
While Glenn's future as an offensive guard looked promising, he suffered a broken neck on October 9 in a game against the Houston Oilers in the first half.
A few hours later, he died because of his injuries to his spinal cord. His 66 jersey was retired.