Philip Adams: Former NFL player who killed 6 had 'unusually severe' stage 2 CTE that can change behavior, expert says
NFL Players Describe Fear, Suicidal Thoughts As Former Teammates Die - Sports Illustrated
Former NFL Pro Bowl player fears he has CTE
Aaron Hernandez CTE finding is huge problem for NFL
Is Football Worth The Brain-Injury Risk? For Some, The Answer Is No : NPR
Is Football Worth The Brain-Injury Risk? For Some, The Answer Is No : NPR
Football and hockey don't necessarily doom players' brains to serious damage
Some parents saying 'no' to tackle football over CTE fears
Chris Borland's Early NFL Exit Doesn't Mean Avoiding Brain Damage, Experts Say - ABC News
Aaron Hernandez Documentary Highlights CTE Problems in the NFL
Does football cause brain damage? Past, current players live with the fear
Family says former NFL player found dead in hotel had CTE
Jaguars Insider: Amid CTE study, Allen Hurns tries to block out news