After 33-year-old father and husband, Chris Watts, dumped his daughters’ bodies in an oil tank and buried his wife in a shallow grave nearby, he picked up a breakfast roll at a Colorado convenience store.

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Colorado's Weld County District Attorney Authorities released a surveillance video of Chris Watts calmly buying his breakfast shortly after the disposal at the oil field.

The video is the important part of the case’s evidence that authorities have been making public in the days since Watts pleaded guilty to the triple murder.

Alongside the casual breakfast purchase, Watts is seen in an orange T-shirt with sunglasses on his baseball cap, chatting with the cashier.

His calm and collected demeanor is especially sickening, now that the truth has come to light that he had murdered and dumped the bodies of 4-year-old Bella, and 3-year-old Celeste. Alongside the murder of his daughters, he had buried his 34-year-old pregnant wife, Shanann in a crude oil field where Watts worked.

Shanann was 15 weeks pregnant.

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The girls would all be found two days later, after Watts reported them missing, and a statewide manhunt was issued.

Watts had made a heartbreaking television appearance, pleading for them to come home.

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Watts pleaded guilty to murdering his wife and daughters after a deal in which prosecutors would take the death penalty off the table.

According to officials, Watts was sentenced to three consecutive life sentences after pleading guilty to strangling his wife and smothering his daughters inside their home.

In the days since his sentencing, authorities have been releasing a number of files related to the case. Another important file includes police station footage of Watts telling his father that he “freaked out” and murdered his wife.

Among the recently released, and continuously chilling, evidence is other surveillance footage captured by Watts' neighbor, showing Watts leaving his suburban Denver home at about 5:30 am to dispose of the bodies.

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Also revealed, Watts had a mistress. Investigators searched through the phone of the mistress, Nichol Kessinger, to find that she had searched for wedding dresses a week before the murders and Googled “anal sex” for 45 minutes prior to her last date with Watts. Her last date was the night before the murders.

Kessinger’s final Google search that investigators noted came after the murders, when she looked into how much money Amber Frey, (the mistress of convicted wife-killer Scott Peterson) made in her tell-all book deal. As well as her net worth.

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She also searched “did people hate Amber Frey.”

A search of Watts' phone found thousands of hidden nude and semi-nude photos of Kessinger in a secret calculator app that was only accessed by typing in a four digit code.

Authorities also released hours of interview footage in the case, including the moment Watts was told he had failed a polygraph test.

Video of that moment shows that Watts managed to, yet again, keep his cool. This time, after he was confronted by a member of the Colorado Bureau of Investigations that his answers were not true.

That agent then began the process to try and draw out a confession, who after talking for some time eventually shut down the interview and demanded to see his father, Ronnie.

“Watts then confessed to killing Shanann to Ronnie, who stayed in the interrogation room as the two agents returned, rubbing his son's back while he told them he had murdered his wife.”

At that time, Watts denied killing daughters Bella and Celeste, a crime he would not admit to until entering his plea deal at the Weld County Courthouse.

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