Colorado police said they executed a search warrant Friday at a home belonging to the fiancé of a 29-year-old woman who has been missing since Thanksgiving.

Investigators hunting for clues in the mysterious disappearance of Kelsey Berreth, of Woodland Park, showed up at Patrick Frazee's property near Florissant Friday morning, Fox 21 Colorado Springs reported.

Woodland Park Police Chief Miles De Young confirmed the execution of the search warrant in a news release. Frazee's attorney said the search warrant came as a surprise to his client.

"The investigative team continues to conduct interviews and other casework in the effort to locate Kelsey," De Young said. "This case is the number one priority for the Woodland Park Police Department and we are working around the clock on it."

A press conference was scheduled for later Friday afternoon.

Kelsey Berreth, 29, was last seen at a supermarket in Woodland, Colorado on Thanksgiving Day. (Woodland Park Police Department)

Frazee is reportedly engaged to marry Berreth, who was last seen around noon on Thanksgiving at a supermarket with their one-year-old daughter.

The Teller County Sheriff’s Office said the search could last three days, KKTV reported.

Frazee attorney Jerremy Loew said Friday that his client continues to cooperate with law enforcement investigating Berreth's disappearance.

"We understand that a search warrant was executed on Mr. Frazee’s property," Loew said. "Mr. Frazee was never asked to voluntarily participate in this search. We encourage law enforcement to take whatever steps it deems necessary to find Kelsey Berreth and to be able to exclude Patrick Frazee as a possible suspect in this missing person investigation."

The attorney said Frazee isn't doing media interviews and is instead focused "on parenting the child he shares with Ms. Berreth."

Berreth, a flight instructor for an aviation company in Pueblo, Colo., dropped off the child with Frazee later on Thanksgiving in a custody exchange, according to reports.

SURVEILLANCE VIDEO OF MISSING COLORADO MOM RELEASED AS SEARCH INTENSIFIES

On Monday, Woodland Park police released surveillance video showing Berreth and the child entering the supermarket.

Frazee told police he got a text from Berreth’s phone on Nov. 25.

Photo shows Patrick Frazee and Kelsey Berreth one year ago. (Missing Mother--Kelsey Berreth Facebook page)

Police said that same day her job got a text from her phone saying that she would not be coming to work for the next week.

Cheryl Berreth reported her daughter missing Dec. 2. She said her daughter and Frazee weren't living together.

MISSING COLORADO MOM'S PHONE WAS USED TO TEXT 3 DAYS AFTER SHE VANISHED, POLICE SAY

"She’s not the kind who runs off," she said at a news conference Monday. "This is completely out of character. Kelsey loves her God, she loves her family and friends, and she loves her job. She’s reliable, considerate and honest.”