A Texas judge has sentenced ex-Marine Eddie Ray Routh to life in prison after a jury found him guilty of murdering former Navy SEAL Chris Kyle. The defense had attempted to argue insanity, a claimed that was rejected by the jury. Kyle is remembered as the deadliest sniper the U.S. military has ever produced, and was featured in the best-selling book and movie adaptation American Sniper. Routh shot both Kyle and another man, Chad Littlefield, while at a shooting range. Kyle regularly took veterans target-shooting as a therapeutic exercise. When Kyle and Littlefield unloaded their weapons, they were both shot in the back. After the shooting, Routh stole Kyle’s truck and eventually drove more than 100 miles before surrendering to police …