Report: Idaho Nurse Investigated in Case of Missing Mom

A new twist in the Kelsey Berreth case backs up theories that the Colorado mother's alleged killer, fiance Patrick Frazee, had some assistance. Sources tell ABC that a 32-year-old nurse in Twin Falls, Idaho, is being investigated for allegedly disposing of Berreth's cellphone. Berreth was last seen in Woodland Park, Colo., on Thanksgiving Day. Three days later, her phone pinged a cellphone tower in Gooding, Idaho, which is around 35 miles from Twin Falls. Authorities in Twin Falls said after Frazee's arrest last month that they had processed "some items of evidence" in the case. The Idaho woman's name has not been released and her relationship to Frazee is unclear.

Frazee, who faces two counts of murder and three counts of solicitation to commit murder, told police he last saw Berreth when they met to exchange their 1-year-old daughter, who is now being looked after by Berreth's family. No body has been found, but authorities say evidence found at Berreth's home suggests she was killed there. The Denver Post reports that District Attorney Dan May has taken the highly unusual step of seeking to withhold the arrest warrant affidavit from Frazee. Analysts say the move, which could be unconstitutional, suggests that May might be trying to stop Frazee from learning the identities of the witnesses against him. (This is why Frazee was hit with two counts of first-degree murder.)