A former Dallas Cowboys player sliced his wife's neck and then crawled on the ground outside their rented Utah condominium before flagging down a police officer, prosecutors said in murder charges filed on Monday.

The bloody scene in the ski town of Park City indicated that Keri 'KC' McClanahan, 28, put up a desperate struggle before she was allegedly killed by her husband Anthony D. McClanahan.

According to police, the murder weapon was a small, sharp knife she'd worn sheathed in a nylon paracord bracelet.

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Ex- Dallas Cowboys player, Anthony D. McClanahan (right), 46, allegedly murdered his wife, Keri McClanahan (left), 28, by slitting her throat while she desperately fought to stay alive

The bloody scene in the ski town of Park City indicated that Keri (right) put up a desperate struggle before she was allegedly killed by her husband (left). According to police, the murder weapon was a small, sharp knife she'd worn sheathed in a nylon paracord bracelet

Her husband was found by police covered in blood and crawling on his stomach outside around 1.30am on November 2.

He lifted himself up just enough to flag down a police officer, then dropped back down and began convulsing, his arms making a 'snow angel motion,' the officer on scene told prosecutors.

Anthony McClanahan was treated for minor injuries and originally told officers he and his wife and baby had been attacked.

McClanahan was charged with first-degree murder in Keri's death. She had two children, aged 7 and 9, with another man. It's not known what his motive may have been

But investigators found no evidence of anyone else going into the building or of a baby at the Park Regency.

His wife's body was found in the condominium he had rented after someone else at the building called 911, saying they'd seen him crawling low to the ground through the hallways and calling for help.

Keri McClanahan had suffered several cuts to the front, back and sides of her neck, as well as other defensive wounds and carpet burns.

Her husband was previously charged with child kidnapping last month after authorities said he took his eight-year-old son from a previous relationship from his school in Arizona on October 3 and traveled with him through Nevada and Utah.

According to court documents, the boy's mom, Donna May, found McClanahan the following day and, with the support of police, demanded him back - but the ex-player refused.

She emailed him a court order demanding the boy back the following day, the documents said, but lost contact.

In the days that followed McClanahan posted photos and videos of himself with his son on Facebook. In one of the videos they were seen giving supplies to a group of homeless people.

Keri McClanahan (pictured on October 25) had suffered several cuts to the front, back and sides of her neck, as well as other defensive wounds and carpet burns

Keri (right, with her husband), who was the mother of a nine-year-old girl and a seven-year-old boy with another man, was a 'beautiful spirit' who was 'instantly loved' by people, according to her sister, Heather Gauf

He was found on October 12 and arrested on a fugitive warrant and locked up in Salt Lake City Jail; he paid $150,000 bail on October 19 and was released. The boy was then returned to his mother May.

McClanahan and his wife rented the condo in Park City a few days after he bonded out of jail, charging documents said.

Keri, who was the mother of a nine-year-old girl and a seven-year-old boy with another man, was a 'beautiful spirit' who was 'instantly loved' by people, according to her sister, Heather Gauf.

'She was such an amazing mother and such a beautiful humanitarian,' she said.

Gauf added that she was worried that it will 'deeply affect my little niece and nephew, to know that their mother was murdered.'

McClanahan, who started his football career at Washington State University, was signed to the the Dallas Cowboys 1993, but was dropped before the season began, according to a 1994 report by NewsOK.

He went on to play for the Calgary Stampeders, and calls himself a 'sports performance consultant'.

McClanahan had his son (seen right in a video posted during the alleged kidnapping) with his previous partner, Donna May. She now has the child back

The alleged kidnapping is not believed to be directly related to the Keri's death, but Gauf said that McClanahan had blamed his reportedly unusual behavior on injuries sustained while playing football.

It's not clear quite what was meant by that, but it's possible that McClanahan had intended to blame CTE - the degenerative brain disorder that has been blamed for Aaron Hernandez's violent impulses.

Hernandez killed himself in prison in April while serving time for murder; an autopsy revealed that his brain had been severely damaged by CTE, which has been linked to repeated blows to the head.

McClanahan was charged with first-degree felony child kidnapping and first-degree murder.

This was the scene of the murder. McClanahan has reportedly blamed his behavior on injuries caused during his football career