This guy is a psycho beginner serial killer.
Started out with animals and had hoped to advance to humans in the military but looks like the Marines might have figured him out and kept him where he had no reason to use his weapons. He told big time lies about his “bravery” in the service for the attention and then finagled the PTSD card. Then he gets home and got his chance to move up to humans. Again, that goes with what I’ve suspected that he went after Kyle because of the fame it’d get him. More sad that Littlefield was drawn into it. The Rangers might want to look into any unsolved murders or missing persons as this can’t be his first human kill.
CBS evening news just reported Kyle was sitting in his truck and text Littlefield while at the gun range that Routh was straight up nuts. So, they knew he was wacko so should have already been aware.