We know of 18 deceased NFL veterans who have been diagnosed post-mortem with chronic traumatic encephalopathy.
The charge against Oscar Pistorius of killing his girlfriend puts him on an unfortunate list.
QB's Poignant Words After Teammate's Death
Chiefs' Gameday Tribute To Jovan Belcher
Ex-Teammate's Perspective: Why I Always Had Strong Affinity For Jovan Belcher