Traumatic Inst News Today

>> reporter: junior seau, who over a 20-year career made an estimated 150 bruising tackles. most of them head first. >> junior seau. >> he would come home and hit the blackout button in the bedroom and black the room out so he could lay down. >> reporter: and in medical documents obtained by abc news and espn and confirmed in an exclusive interview with his family, we learned for the first time that this monster in middle, who killed himself last year, suffered severe brain damage from repeated ...