In December 2012, Jovan Belcher of the Kansas City Chiefs killed his girlfriend before taking his own life. His remains were not tested for CTE, media reports said.
The NFL launched a crisis support line in July 2012 for players, former players and their families. Called NFL Life Line, it operates independently from the NFL and promises to keep all calls confidential.
"There is no higher priority for the National Football League than the health and wellness of our players," NFL Commissioner Roger Goodell wrote in a letter to personnel and fans at the time.