FREDERICK, Colo. -- The bodies of two young girls werebefore authorities discovered them, according to court documents filed by an attorney defending the girls' father against accusations that he killed his children and wife.
The motion filed Friday by Christopher Watts' attorney, James Merson, also asked that DNA swabs be taken from the girls' necks. The request quotes an expert, Richard Eikelenboom, who believes the oil would not eliminate DNA and said samples can be obtained "after strangulation."
Eikelenboom also recommended taking DNA samples from the girls' hands and the hands and nails of their mother.
Authorities separately announced that the Weld County Coroner's Office had performed autopsies on Friday and confirmed the bodies as 34-year-old Shanann, 4-year-old Bella and 3-year-old Celeste Watts.
Police have not released any information about how the mother and daughters died. More testing is planned to help determine that.
After the three were reported missing on Monday, Watts told reporters that he missed them. He said, before his arrest, that he longed for the simple things like telling his girls to eat their dinner and gazing at them as they curled up to watch cartoons.
Speaking to local television station 9News Tuesday, Watts described an "empty house," saying he had "no inclination" where his pregnant wife and daughters could be. "I have no idea like, where they went," Watts said. "It's just earth-shattering. I don't feel like this is real right now. This is like a nightmare I can't wake up from."
A former FBI profiler told CBSN the televised plea for the return of his wife and young daughters
Authorities are expected to file formal charges Monday against Watts, an oil and gas worker who authorities said dumped his wife and daughters' bodies on his employer's property.
CBS Denver reported that Chris Watts confessed to killing Shanann and the two girls. CBS News has not independently confirmed that he admitted to police that he killed them.
Police said the mother, Shanann, was found dead on property owned by Anadarko Petroleum, one of the state's largest oil and gas drillers, where 33-year-old Christopher Watts worked as an operator. Investigators found the bodies of Bella and Celeste nearby.
Watts was fired on Wednesday, the same day he was arrested, the company said. He did not respond to reporters' questions when he was escorted into the courtroom Thursday.
Merson, Watts' attorney through the Colorado State Public Defender's Office, left Thursday's court hearing without commenting to reporters. He did not respond to multiple messages seeking comment by The Associated Press.
Police have not released any information about a possible motive.
According to a June 2015 bankruptcy filing, Christopher Watts had gotten a job six months earlier as an operator for Anadarko, and paystubs indicate his annual salary was about $61,500. Shanann Watts was working in a call center at a children's hospital at the time, earning about $18 an hour -- more for evenings, weekends or extra shifts she sometimes worked.
But the family remainedfrom debt and other obligations.
The couple had a combined income of $90,000 in 2014. But they also had tens of thousands of dollars in credit card debt, along with some student loans and medical bills -- for a total of $70,000 in unsecured claims on top of a sizable mortgage. They said in the filing that their nearly $3,000 mortgage and $600 in monthly car payments formed the bulk of their $4,900 in monthly expenses.
The family's two-story home is just outside Frederick, a small town on the grassy plains north of Denver, where fast-growing subdivisions intermingle with drilling rigs and oil wells.
Details about what led police to arrest Watts late Wednesday night on suspicion of three counts of murder and tampering with evidence likely were to be revealed next week. Prosecutors will ask a court to unseal the affidavit for Watts' arrest after filing formal charges, which are due by mid- afternoon on Monday, said Krista Henery, a spokeswoman for district attorney Michael Rourke.
Family and friends of Shanann Watts are left searching for answers, trying to reconcile Watts' cheery Facebook posts about her daughters, her pregnancy and her love for her husband with the pending charges.
On Friday night, hundreds of neighbors gathered for an emotion vigil to remember Shanann, who was 15 weeks pregnant, and the girls.
The case has focused attention on Colorado's lack of a law allowing homicide charges in the violent deaths of fetuses, which is the case in 12 states. Proposals to allow homicide charges in the violent deaths of fetuses in Colorado have been stymied by debate about how to avoid infringing on abortion rights.
Republican lawmakers last tried to change the law after a 2015 case in Boulder County. A woman named Dynel Lane was charged with attempted murder and unlawful termination of a pregnancy for cutting open a pregnant woman's belly and removing her unborn baby girl. Prosecutors said they could not charge Lane with murder because a coroner found no evidence the infant lived outside the womb.
State law does allow a homicide charge if a fetus was alive outside the mother's body and then killed. State lawmakers in 2013 also allowed prosecutors to add extra felony charges against anyone who commits a crime that causes the death of a fetus.