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Colorado prosecutors are demanding that triple-murder suspectChris Wattsturn over DNA samples, fingerprints, palm prints and photographs of his hands in their case against him in the deaths of his pregnant wife,Shan’ann Watts, and their two young daughters.

In a motion filed Thursday, prosecutors asked the judge to compel Chris to provide them the evidence. The court has not yet ruled on the motion and the defense has until Monday to respond.

A source close to the case says prosecutors “are working very carefully. They know they can’t make a single mistake.”

Chris, 33,faces first-degree murder chargesamong other charges related to the killings of his 34-year-old wife and their two daughters, Celeste, 3, and 4-year-old Bella.

Under police questioning,Chris allegedly admitted he had strangled Shan’ann— but he gave a startling reason for doing so.

Shan’ann Watts (right) and her daughters.Shanann Watts /Facebook

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Chris Watts.Joshua Polson/AP/REX/Shutterstock

Christopher Watts court case, Greeley, Colorado, USA - 16 Aug 2018

Chris was arrested late on Aug. 15, the day before the bodies of his wife and daughters were found. He is being held without bondin the Weld County Jail. He has not yet entered a plea.

RELATED VIDEO: Triple Murder Suspect Dad Chris Watts in Court

A source close to the investigation previously told PEOPLE, “The theory that she [Shan’ann] did it doesn’t hold any water. There is absolutely no evidencethat she killed her children.”

Chris’ lawyer has not responded to PEOPLE’s requests for comment but,according to a statementfrom the state’s public defender’s office, their attorneys are barred from discussing ongoing criminal cases.

source: people.com