Transcript for Defense Rests in the American Sniper Trial
And now to Texas, and breaking news tin the "American sniper" trial. Tonight, the defense resting their case. A new look at the man accused of killing Navy S.E.A.L. Chris Kyle. The defense from senting images of him, right there in uniform with his mother. Far different than that other image in the backseat of a police cruiser. And now comes word that he will not take the stand. ABC's Ryan Owens with late developments from Texas. Reporter: "The jury taking a twisted trip into the mind of a killer, guided by a defense psychiatrist who just last year diagnosed the marine veteran with severe schizophrenia. Dr Michael Dunn says while "American sniper" Chris Kyle is a war hero to many -- I just want to get the bad guy. Reporter: -- To Eddie routh on the day he killed them, Kyle and his friend Chad Littlefield were "Pig assassins" sent to execute him as part of "Pigs taking over the Earth." Dr. Dunn testifying routh was so paranoid at this Texas gun range, he thought shooting the two men in the back was self-defense. "He thought he was going to die" and had to "Neutralize the threat." Routh doesn't look up as the doctor says he was insane and didn't know right from wrong. Chris Kyle's widow taya shakes her Ned head in disbelief. On cross examination, prosecutors point out the defense is paying this expert $400 an hour and that routh is a fan of the pig hunting reality show "Boss hog." And may have just cooked up this elaborate story to try to get away with murder. The defense briefly called routh's mother back to the stand so the jury could see this picture of a decorated young marine with his mom. Prosecutors took the chance to show a very different picture taken years later with his girlfriend. Rate this afternoon, Eddie routh waved his right to testify. With that, his defense rested, relying, remarkably, on the medical testimony of just one doctor. David? Ryan Owens from Texas. Thank you.
This transcript has been automatically generated and may not be 100% accurate.