Shanann Watts had known about her husband Chris’ affair prior to her death.

A lawyer for the Watts family, Steven Lambert, spoke with Dr. Phil McGraw in apre-recorded interviewduring which Lambert shared new details of the murder of the pregnant Colorado mom and her daughters Bella, 4, and 3-year-old Celeste.

“In that fight, [Chris] essentially confessed to having an affair, that he wanted a divorce, that it was pretty much over between them,” Lambert tells McGraw. “[Shanann] said something to the effect of, ‘Well, you’re not going to see the kids again.’ As a consequence of that conversation, he strangled her to death.”

The Watts family.Facebook

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Lambert also reveals that Chris and Shanann’s eldest child witnessed their mother’s murder.

“Bella walked in and asked, ‘What are you doing with mommy?'” Lambert says.

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After killing Shanann, Watts then smothered his two daughters. He then loaded their bodies into his truck and hid them on an oil work site where they were found three days later.

In November, Watts pleaded guilty to all three killings. He is currently serving five life sentences without the possibility of parole.

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A Feb. 18 statement to PEOPLE from the Colorado Bureau of Investigation says that authorities “interviewed Christopher Watts for the purpose of developing further insight into the case. Watts provided investigators with additional information about the murders of Shanann, Bella, and Celeste during the interview.”

A spokesperson for the Weld County District Attorney’s Office tells PEOPLE the office is not releasing any more information on the case.

source: people.com