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Chris Watts made a chilling confession about killing his pregnant wife in a letter from prison.
Cherlyn Cadle, 67, shared the details after revealing she was a prison pen pal of Watts who sent her a 12-page letter that left her in tears.
Cadle, a grandmother of 12, appeared on Lifetime's Cellmate Secrets where she said: "He told me he would daydream about killing Shanann.
"She would be yelling at him or be upset about something and he wouldn't fight back, but he would just stand there and just daydream about what it would be like to kill her."
Chris Watts murdered Shanann and their two children in 2018, with his horrific crimes going on to become the subject of Netflix documentary American Murder: The Family Next Door.
Speaking to Fox News about her reaction to reading the letter, Cadle said: "I just broke down and started bawling.
"I cried and cried. I just couldn't believe what he did to those girls. It was a real shock to read his letter."
Cadle explained how she initially reached out to Watts after seeing his first interview on TV. She said: "When I saw his first interview, I don't know, I looked at him that morning and I just felt something really spoke to me.
"It was like a calling for me to contact him and see if he would share his story with me. I knew he was guilty. You could tell by the way he was talking, the body language. But it was just one of those things where I really felt like I was supposed to do it."
Another person who appeared on Cellmate Secrets was Christa Richello who spoke about the bond she developed with the killer.
According to E! News, 42-year-old clinical psychologist Christa admitted to developing a 'close and intimate relationship' with Chris and cellmate Dylan Tallman after sending Chris fan letters in prison.
Christa, who is now actually engaged to Dylan, talks about her fascination with Chris' case and says: "I found it very odd, the way the case was handled.
"I've never seen a case in history that somebody took a plea agreement so quickly, a case was completely ended and not investigated.
"And there's all these different theories because normally this would be going on in a trial for years, and it was only two months to this plea agreement. And that's what caught me."
Chris Watts is currently serving a life sentence for the 2018 murders of his wife Shanann, who was 15 weeks pregnant, and their daughters Bella, four, and Celeste, three.
Keen to start a new life alongside a woman with whom he'd been having an affair, Watts had murdered his family before burying his wife in a shallow grave at the Anadarko Petroleum site and disposing of his children's bodies in one of the petrol tanks.
Initially, Watts had claimed that it was Shanann who had killed the kids and so he had strangled her in a rage, before he ultimately confessed to everything.
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