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(CNN) —

It became apparent from Chris Watts’ research for secluded vacation destinations and jewelry that the married Colorado father had found a new love interest, but what led him to kill his pregnant wife and two young children may never be known, a prosecutor said.

“I don’t think he will ever tell us. I don’t think he will give an honest assessment of why he did what he did, how he did what he did,” Weld County District Attorney Michael Rourke said after Watts was sentenced Monday to five life sentences – three consecutive and two concurrent – with no possibility of parole.

Before learning that he would never walk out of prison, Watts sat at the defense table, head down and leg bobbing, as his mother told him she loved him and his slain wife’s family called him a monster.

Judge Marcelo Kopcow called the murders in a north Denver suburb “the most inhumane and vicious crime that I have handled out of the thousands of cases that I have seen.”

Watts also received an additional 48 years for the unlawful termination of his wife’s pregnancy and 36 more years for crimes related to his disposal of the bodies.

The couple’s first son would have been named Nico Lee, according to his wife’s father.

02:33 - Source: CNN

Chris Watts gets life in prison for killing pregnant wife, kids

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Additional Embargo: Additional Source(s): POOL Date Shot: 11/19/2018 Shipping/Billing Info: Description: Projects: None Cost Center: Atlanta National Desk / 20100101 Created By: kdevlin On: 1542635649 --------------------------------------------------------------------------------

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Christopher Watts is escorted into the courtroom before his bond hearing at the Weld County Courthouse on Thursday, Aug. 16, 2018, in Greeley, Colo. Watts, of Colorado, whose wife and daughters disappeared this week was arrested on suspicion of killing them. (Joshua Polson/The Greeley Tribune via AP, Pool)

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