'American Sniper' Trial Reveals Details About Murder Suspect

Testimony details behavior of the man accused of killing Navy SEAL Chris Kyle.
2:04 | 02/14/15

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Transcript for 'American Sniper' Trial Reveals Details About Murder Suspect
We start with a twist in the story in the headlines and your local movie theaters. The man accused of killing American sniper Chris Kyle on trial. His lawyer insisting the deft is insane. This morning, we're getting Intel into his behavior moments before he killed the Navy S.E.A.L. And his friend, both who were trying to help him. Rep tter:he state of Texas versus Eddie routh was never a whodunit. He admits he killed Chris Kyle and his friend, Chad Littlefield, two years ago. The mystery is motive. In court Friday this sheriff's deputy testified he overheard routh say this in jail. I was riding in the backseat of the truck and nobody would talk to me. They were just taking me to the range. Soy shot them. I feel bad about it. But they wouldn't talk to me. I'm sure they have forgiven me. During opening statements, defense attorneys revealed the two victims' secretly exchanged text messages about routh, a vet with PTSD they were trying to held. Chris Kyle was thin the driver's seat on his tell foen and he texts Chad Littlefield sitting right next to him, this dude is straight up nuts. ? Don't pick it up. Reporter: Chris Kyle is the hero of the block buster "American sniper." His wife, taya, testified tearfully on the first day of the trial. On Friday, she watched as the jury heard for the first time from a member of the killer's family. His uncle. James Watson testified that just after the murders, his nephew stopped by and said, check out my truck. I'm driving a dead man's truck. Routh is pleading not guilty by reason of insanity. His uncle told the jury he seemed different after he came hope home from the military. For "Good morning America," Ryan Owens, ABC news, stevenville, Texas.

This transcript has been automatically generated and may not be 100% accurate.

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