Stunning Video in 'American Sniper' Trial

Dash cam video captures moment double-murder suspect takes off after alleged murders.
2:15 | 02/12/15

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Transcript for Stunning Video in 'American Sniper' Trial
American sniper trial and the stunning video revealed in court today. This is the former marine accused of killing navy seal Chris Kyle and his friend the images from his days in Iraq. And this is what he looks like Dow and that Texas courtroom tonight the video captured by the police cruiser revealing the moment the suspect takes off. A short time later surrendering as police then Russian. That marine veteran is pleading not guilty by reason of insanity but ABC's wide Owens reports tonight the prosecution is hoping these videos will prove otherwise. This is dash cam video of police chasing double murder suspect any Ralph. Just hours after he killed Chris Kyle and his friend Chad Littlefield one officer rams the truck watch that collision again. It doesn't stop Ralph. The chase reaches speeds of more than a hundred miles an hour before the truck has mechanical problems and stops in the middle of the interstate. Ralph get itself hands in the air and here's another angle of his take down from a different dash cam the marine veteran who served in Iraq is pleading not guilty by reason of insanity. But prosecutors say the fact he is fleeing from police. Proves he knows right from wrong the truck Ralph is and belonged to navy sniper Chris trial. Whose story is told in the blockbuster American sniper and pick it up. Kyl along with little field. Brought Rell to this gun range to help them cope with PT SD that's where prosecutors say Ralph shot them in the back multiple times and stole Kyle's pick up. You couldn't he could see that they want to receiving lately. Like who are clinking and iPod. Chris Kyle's widow detail was back in court for a second day after her tearful testimony Wednesday prosecutors played another tape for the jury this afternoon. This shaky video is from an officer's body camera. That's Ralph sitting in the truck just before that police chase his neighbor who's also a cop is trying to get him to surrender the officer says Ralph tells them. I've taken a couple of souls and I have some more souls to take. These videos may not be quite the slam dunk for the prosecution they appear. On them Ralph rail bulls talking about doubles living among us even saying he's insane.

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

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