The gunman who shot and killed an NYPD officer and three other people in midtown Manhattan on Monday carried a handwritten note claiming he had CTE — a degenerative brain disease that is the result of ...

It isn’t yet possible to diagnose chronic traumatic encephalopathy—more widely known as CTE—in the living. Yet for many people, especially athletes, the fear is real. In fact, 1 in 3 former NFL ...