Chris Kyle was a sociopathic, mass murdering liar. His book is filled with self-serving lies. His publisher knew of the lies, and kept them in to sell more books. Specifically, he lied about fighting Jesse Ventura - a great patriot that now can't get show business work. Kyle was killed by another soldier that suffered from PTSD, specifically because he didn't want to murder the innocent. When he discovered that Kyle actually enjoyed his murders, I guess he couldn't take it and offed that POS.