WATCH: Man pleads guilty to killing pregnant wife, 2 daughters in Colorado

WATCH: Man pleads guilty to killing pregnant wife, 2 daughters in Colorado

Transcript for Man pleads guilty to killing pregnant wife, 2 daughters in Colorado

Colorado tonight, and to a father and husband accused of killing his pregnant wife and their two little girls. You’ll remember he made a public plea for his wife, his family to come home. Tonight, he’s offering a plea deal to save his own life. ABC’s Clayton Sandell in Colorado. Reporter: He was once seen as a devoted husband and father. He was the one for me. And he is amazing. My daddy is a hero. Reporter: But tonight, Chris Watts pleading guilty to murdering his pregnant wife and two young daughters, leaving their bodies in this Colorado oil field. 34-year old shan’ann Watts, 4-year-old Bella and 3-year-old Celeste vanished from their Frederick, Colorado, home August 13th, Watts pleading for their return. Shan’ann, Bella, Celeste, if you’re out there, just come back. Reporter: Days later, the girls’ bodies were found submerged in remote oil tanks, shan’ann in a shallow grave nearby. According to investigators, Watts was having an affair with a co-worker. He confessed to strangling shan’ann in a fit of rage after claiming she killed the girls. Frankly, a flat-out lie has been corrected. The spotlight shines directly where it belongs, on him. Reporter: Shan’ann’s family was in this courtroom today, they were sobbing and comforting each other. The minimum sentence Watts could face is life in prison without parole, but with today’s plea agreement, he will not face the death penalty. David? Clayton Sandell in Colorado tonight.

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

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