Kelsey Berreth, 29, was last seen in a grocery store near her home in Woodland Park, about 15 miles (24 kilometers) from Florissant.
The fiancé of a 29-year-old U.S. woman who vanished almost a month ago from a small mountain town was arrested on Friday on murder charges in her disappearance, though investigators have yet to locate the young mother's body, police said.
De Young said that following numerous interviews over the past several weeks, investigators had gathered enough information to file for an arrest warrant.
Berreth has family in that state, Woodland Park Police Chief Miles De Young said.
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Authorities also declined to elaborate on the solicitation of murder charge, how they believe Berreth was killed or any other aspect of the investigation.
"It is a crime to solicit somebody to commit another crime", Teller County District Attorney Don May said at a news conference Friday, while adding that the charge does not require that someone actually complete the crime for which they were approached.
A lawyer from the public defender's office was appointed to represent Frazee, according to court documents. The couple shared a baby daughter but did not live together. "We don't know what to do, so we came together to pray for her family tonight so that God would just be with them, comfort them".
The disappearance of the young pilot mystified family and friends and led to national social media seeking any information on her whereabouts.
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Police have said Frazee was the last person to see Berreth alive. Surveillance footage showed the young mom entering the store while carrying her daughter in a vehicle seat.
Frazee's attorney, Jeremy Loew, did not immediately respond to a request for comment from The Washington Post.
Police said they have surveillance video of Berreth, a flight instructor, shopping with her daughter that day at a Woodland Park supermarket. Investigators were working to recover it. Police said the only signs of Berreth after Thanksgiving were some text messages and that location data suggested the phone by November 25 was near Gooding, Idaho, 800 miles (1,290 kilometers) from her house. Days later, her cellphone was pinged hundreds of miles away.
The investigation opened December 2 after Berreth's mother requested a police check on her daughter. Investigators found all of her suitcases, personal items and vehicles at her home. Berreth's cousin, Jodi Garretson, told Inside Edition her family was "absolutely devastated" by the news that authorities do not believe Berreth is still alive.
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The most recent search was conducted Tuesday after eyewitnesses told Colorado Springs' KRDO News that they had spotted him the previous day dropping off trash at a Teller County waste management facility.