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N.D. (AP) — A man accused of writing a threatening letter to a federal judge from his jail cell in Jamestown has pleaded guilty.

Robert Lee Johnson is charged with mailing threatening communications. It carries a maximum penalty of 10 years in prison.

Authorities say Johnson threatened to kill U.S. District Judge Ralph Erickson and his family upon his release from prison. The letter was delivered to the federal courthouse in Fargo on June 17, 2014.

A sentencing date has not been scheduled.