Bengals wide receiver Chris Henry's death - after falling from a truck during a domestic dispute in 2009 - shocked football fans. An autopsy by the BIRI found that the 26-year-old had chronic traumatic encephalopathy.
"I was surprised in a way because of his age and because he was not known as a concussion sufferer or a big hitter. Is there some lower threshold when you become at risk for this disease? I'm struggling to see if something can come out positive out of this," Dr. Julian Bailes of the BIRI grimly told the New York Times.