The Idaho nurse that was involved in the case of missing Colorado mom Kelsey Berreth has been formally charged and will appear in court on Friday.

Krystal Jean Kenney, 32, was charged with one count of tampering with physical evidence. The Twin Falls, Idaho, nurse will have her court appearance in Teller County, Colorado, where Berreth went missing last year.

The charges against Kenny come weeks after she was investigated by police for involvement in Berreth’s disappearance. Kenny is accused of tampering with Berreth’s cell phone, which unexplainedly pinged off a cell tower in Gooding, Idaho, three days after she went missing.

Kenny is suspected of having an affair with Patrick Frazee, the fiancé of Berreth and the father of the couple’s daughter.

Berreth went missing on Thanksgiving Day and was last seen with her daughter at a Woodland Park, Colorado, Safeway supermarket. Frazee was thought to be the last person to see her alive. Her mother reported her missing on Dec. 2.

After an investigation, Frazee was charged with two counts of first-degree murder and three counts of solicitation to commit first-degree murder on Dec. 31.

Berreth is thought to be dead by authorities, but her body or remains have yet to be found.