Colorado dad Chris Watts is currently sitting behind bars for the murders of his wife, two daughters and unborn child, but now a recent clip from Dr. Phil reveals more gruesome details about their deaths. An attorney for Frank and Sandy Rzucek, Shan’ann Watts‘ parents, said Bella, 4, actually walked in on him disposing of her body.

“Bella walked in and asked, ‘What are you doing with mommy?'” Steven Lambert said in the video obtained by Oxygen.

According to him, Watts, 33, killed his wife after she arrived home from a business trip. The pair had allegedly gotten into a fight but had made up and were “getting along quite well” before they got into another argument.

“In that fight, he essentially confessed to having an affair, that he wanted a divorce and that it was pretty much over between them and she had said something to the effect of, ‘Well, you’re not going to see the kids again,'” he said in a clip from the show airing Tuesday. “As a consequence of that conversation, he strangled her to death.”

Bella and Celeste Watts photos

Although Watts eventually pleaded guilty to their slayings, there was reportedly a lot of “yelling and crying” before his confession.

“Their evidence against him was overwhelming,” a source told People at the time. “There was some yelling and some crying, but eventually, he acknowledged that his life was over after he killed Shan’ann. He would have been facing years of legal challenges, and best-case scenario, he would have been acquitted. Worst-case scenario, he gets put to death.”

Prior to his conviction, Chris pleaded to cameras for the girls’ safe return home. He later changed his story and said he murdered Shan’ann in “rage” because she killed Celeste when he said he wanted to separate.

“There was physical evidence and his own words that would convict him,” the source continued. “His story didn’t work. He got angry. He didn’t want to plead guilty. But he really had no choice, considering the evidence. It took a little bit of time for him to come around, but he did.”

Watts was given three life sentences without the possibility of parole for his crimes.

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