February 2, 2013
Chris Kyle, author of the autobiography American Sniper, and his friend Chad Littlefield are killed by Eddie Routh who suffered from PTSD
The friends had been trying to help their fellow former soldiers through his PTSD. Kyle had told Littlefield he believed Routh was unstable and to “watch (his) six” (watch his back). When questioned after the shooting, Routh claimed during the drive to the shooting range neither Littlefield or Kyle had spoken to him, which irritated him, so when he had a gun available to him he shot them both.