The study was released just days after the murder-suicide of Kansas City Chiefs linebacker Jovan Belcher. It's not yet known what triggered Belcher's action, but they mirror other NFL players who have committed suicide. Researchers at Boston University's Center for the Study of Traumatic Encephalopathy published the largest case series study of CTE to date, according to the center. Of the 85 brains donated by the families of deceased veterans and athletes with histories of repeated head trauma, they found CTE in 68 of them. Of those, 34 were professional football players, nine others played college football and six played only high school football. Of the 35 professional football players' brains donated, only one had no evidence of the disease, according to the study.
The study is: http://m.brain.oxfordjournals.org/content/early/2012/12/02/brain.aws307.short?rss=1 CNN: http://www.cnn.com/2012/12/04/health/football-brain-disease/index.html