Patrick Frazee asked an Idaho woman “to kill the mother of his child” a month before 29-year-old Colorado mother Kelsey Berreth vanished on Thanksgiving, a couple claimed Wednesday.

Joe and Patty Rockstahl told KMVT they contacted the FBI after they connected information one of their employees told them to the case of Berreth, who is presumed dead by authorities. The couple, who own Rockstahl Law Offices, said one of their employees told them in October that her best friend said, “a man had asked her to kill the mother of his child.”

The friend, identified as Krystal Lee, is being investigated in connection with Berreth’s disappearance. Berreth’s cellphone pinged from Gooding, Idaho, three days after she was last seen alive.

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"If we could've just gotten the police to call or drive by and say, 'Are you thinking of killing someone?' that would've stopped it," Joe Rockstahl told KMVT. "We wouldn't be here. We wouldn't have all of this going on."

COLORADO MOM KELSEY BERRETH MISSING SINCE THANKSGIVING: A TIMELINE OF EVENTS

The Rockstahls said they asked to talk to Lee, but the meeting never happened. Lee also told her friend to “forget the whole thing,” the couple said, adding that they didn’t contact authorities sooner because the information was vague and coming from a secondhand source.

Patty Rockstahl said she finally called the FBI after seeing Berreth’s mother, Cheryl Berreth, plead with the public for her daughter’s return.

“I think the mother that had the courage to go on TV when her daughter was missing, saying that someone knew where she was at,” Patty Rockstahl said. “At that point in my mind I thought that Patrick, and that was the only name I had heard him called, I didn't know his last name, had done something to her daughter and he knew where she was at.”

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

Four days after she called the FBI, Frazee was arrested in Berreth’s murder.

IDAHO WOMAN BEING INVESTIGATED FOR POSSIBLY DISPOSING OF KELSEY BERRETH'S CELLPHONE: REPORTS

The Colorado mother’s mysterious disappearance came to light 10 days after she was last seen on surveillance video, entering a Safeway grocery store in Woodland Park with her 1-year-old daughter Kaylee, who she shared with Frazee.

Frazee was arrested in late December and charged with first-degree murder, first-degree felony murder and three counts of solicitation to commit first-degree murder after authorities found enough evidence to connect him to his fiancee’s disappearance.

Berreth’s body has not been located.