New videos reveal double life of man who killed wife and children

Chris Watts told police on video he choked his wife to death after she'd murdered their daughters; his family said they believe his story.
2:03 | 11/30/18

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Transcript for New videos reveal double life of man who killed wife and children
investigation of the Colorado father who authorities say killed his wife and daughters. Tonight, for the first time, we hear from his mistress. Here's Clayton Sandell. Reporter: Tonight, new videos revealing the double life of a family man turned killer. Chris Watts, seen here shortly after his arrest for a triple murder. A neighbor's security camera captured Watts backing into the family garage August 13th. Police say he loaded the bodies of wife shanann and daughters CICI and Bella into his work truck, dumping them in a remote oil field 60 miles away. Two days later, leading police to the spot. Is that "S" for shanann? Okay. And where are the girls at? Here and here. Reporter: Drones above spot a bedsheet police say Watts wrapped around his pregnant wife before burying her in a shallow grave. The girls, stuffed into storage tanks. I don't know. They're not coming home. Reporter: Prosecutors say Watts killed his family to start a new life with his mistress, Nichol Kessinger. He lied to me, because if I had known that he had a child on the way, I'd have never wasted my time with him in the first place. Reporter: Investigators say Kessinger googled the name amber Frey, the girlfriend of Scott Peterson, who murdered his pregnant wife. Kessinger allegedly searching for how much much Frey made on her book deal. And, "Did people hate amber Frey?" Before Watts pleaded guilty to all three murders, he would blame his wife for murdering the children. I freaked out. You understand me? And you choked her, or -- That's just, it's rage. Good god almighty, son. Reporter: We spoke to the family of Chris Watts today. They tell us they still believe his version of the story and say they still love and support him. David? Clayton, thank you.

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

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