JACKSONVILLE, FL - DECEMBER 23: Tight end Aaron Hernandez #81 of the New England Patriots looks on during an NFL game against the Jacksonville Jaguars at EverBank Field on December 23, 2012 in Jacksonville, Florida. (Photo by Michael DeHoog/Sports Imagery/ Getty Images)
A number of the brains studied by doctor Ann McKee and her researchers. Almost all of the brains McKee has studied were found to have CTE.
The troubled former New England Patriots player died of an apparent suicide earlier this year.
George Gojkovich via Getty Images
Almost all of the tested brains exhibited signs of chronic traumatic encephalopathy (CTE).
Former NFL running back Kevin Turner suffered from the most advanced stage of chronic traumatic encephalopathy, or CTE, a degenerative disease linked to repeated brain trauma, when he died at age 46,...