By — Amna Nawaz Amna Nawaz By — Jackson Hudgins Jackson Hudgins By — Ryan Connelly Holmes Ryan Connelly Holmes Leave your feedback Share Copy URL https://www.pbs.org/newshour/show/new-study-reveals-widespread-signs-of-brain-trauma-among-former-nfl-players Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Audio At least one in four NFL players has CTE when they die, according to a new study that examined the brains of former pro players. CTE is a brain disease thought to be caused by years of sustained head trauma and can only be diagnosed after an autopsy of the brain. Amna Nawaz spoke with Dr. Chris Nowinski of the Concussion and CTE Foundation, and a co-author of this study. Listen to this Segment By — Amna Nawaz Amna Nawaz Amna Nawaz serves as co-anchor and co-managing editor of PBS News Hour. @IAmAmnaNawaz By — Jackson Hudgins Jackson Hudgins By — Ryan Connelly Holmes Ryan Connelly Holmes