Chris Watts wrote letters to a fellow inmate reflecting on his relationship to his wife and mistress.
Pregnant mom Shanann, 34, and her two young daughters Bella, four, and Celeste, three, were last seen on August 13.
Several days later, their bodies were discovered and Shanann's husband and Watts was arrested on three counts of first-degree murder.
Despite having initially denied knowing what happened to his family - even conducting TV interviews begging for their safe return - with Watts later pleading guilty to their murders.
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Shanann had been strangled before her body was dumped on the site of an oil and gas company, wgile the two girls were suffocated and located hidden in oil tanks nearby.
Watts was subsequently convicted of nine charges - five counts of first-degree murder, one count of unlawful termination of a pregnancy and three counts of tampering with a deceased human body - and sentenced to life in prison without the possibility of parole.
From prison, he wrote letters to author Cheryln Cadle, which included graphic descriptions of smothering his daughters and murdering his wife.
And it would appear that Watts has since tried to justify his actions in another series of letters sent to a fellow inmate.
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The handwritten letters, seen by The New York Post, were sent to an inmate in the next door cell called Dylan Tallman.
One of the notes reads: "She [Shanann] was really busy with her job and everything it required."
The outlet also reports that one of the letters also brands Shanann 'a control freak'.
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Watts then goes on to speak about Nichol Kessinger - a colleague he'd begun having an affair with behind Shannan's back shortly before he murdered his family.
A note reads: "I met Nichol. She was just everything my wife wasn’t like with me. She was just nice, and not a control freak. We could make decisions together."
He explained that he and Kessinger 'knew each other for awhile' but 'didn't start messing around until six weeks before' - with Kessinger claiming that Watts had told her he was going through a divorce when they first started seeing one another romantically.
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Watts continued: "I was not thinking. We worked together, we had chemistry, and I fell into temptation. She was the forbidden fruit."
However, he then said Kessinger 'became the death of [him]' and in a previous letter seen by The Post, Watts allegedly slammed his mistress a 'jezebel'.
In the letter dated March 2020, it's reported that he lay the blame on Kessinger, writing 'the words of a harlot' made him 'low' and 'her flattering speech was like drops of honey that pierced [his] heart and soul'.
He added: "Little did I know that all her guests were in the chamber of death. The lust of the eyes, the lust of the flesh and the pride of life… How did I not see it? [...] The web of the enemy squeezes around my heart and is cocooning my soul to the point of suffocation."
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If you have experienced a bereavement and would like to speak with someone in confidence, contact The Compassionate Friends on (877) 969-0010.
Topics: Crime, True crime, US News, Mental Health
Poppy Bilderbeck