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After Allegedly Hiding Bodies of Pregnant Wife & Kids, Chris Watts May Have Left Something Incriminating Behind

Steve Helling

When the bodies of Shan’ann Watts and her two young daughters were discovered at a remote Colorado oil field in mid August, police found something else at the scene which may further link the three deaths to Chris Watts, Shan’ann’s husband the father to her girls.

A non-porous bag with a possible footprint was found, according to a prosecution motion obtained by PEOPLE.

In the filing, dated Tuesday, authorities requested to take a print of Chris’ bare feet so they can determine if it matches those found on the bag.

A source close to the investigation confirms to PEOPLE that a bag bearing a possible footprint was found at the oil site, some 40 miles east of the Watts home.

But the source declined to divulge the size or the material of the bag.

RELATED: How the Watts Family Murder Case Unfolded

Chris Watts in court

“There was a lot of evidence collected at the scene,” the source says. “and each piece is being carefully inspected to see if it pertains to the case or not.”

Citing “numerous items of evidence” that are being tested, prosecutors have sought to obtain Chris’ DNA and fingerprints as they continue to build a case against him.

The defense has vigorously disputed this request, describing it as too vague and lacking established probable cause. The judge has not yet ruled.

Chris has been sitting in the Weld County Jail for more than a month.

He was arrested late on Aug. 15 and charged with first-degree murder, among other crimes, in the deaths of 34-year-old Shan’ann, who was 15 weeks pregnant, and daughters Bella, 4, and Celeste, 3.

RELATED: Shan’ann Watts Beat Odds to Have Kids Despite Lupus — and ‘Was So Excited’ About It

The three were reported missing on Aug. 13, not long after Shan’ann returned from a work trip, and authorities announced their bodies were found on the property of Chris’ former employer Anadarko Petroleum within hours of him being taken into custody.

Anadarko fired Chris the same day as his arrest.

Shan'ann Watts (center) and her daughters

RELATED VIDEO: Pregnant Mom & 2 Daughters Killed at Home — Allegedly by Husband — Before Bodies Were Dumped

In Chris’ arrest affidavit, obtained by PEOPLE, investigators revealed they discovered his affair with an unnamed co-worker, which he initially denied.

Afterward, he confessed to “the truth,” the affidavit states — claiming he strangled Shan’ann in a rage after watching her strangle Celeste when he told her he wanted to separate. Bella was seen apparently lifeless on her bed, according to the affidavit.

He allegedly told police he then hid all three bodies at the oil site.

RELATED: Chris Watts’ Defense Might Try to Blame Slain Wife for Killing Girls, Legal Expert Says

However, a source close to the investigation previously told PEOPLE that “there is absolutely no evidence that she [Shan’ann] killed her children.”

“Just based on the preliminary evidence, everything is consistent with him killing them all,” the source said.

Chris has not yet entered a plea. His lawyer did not respond to PEOPLE’s requests for comment but, according to a statement from the state’s public defender’s office, their attorneys are barred from discussing ongoing criminal cases.