A man accused of threatening to kill a federal judge in North Dakota has pleaded not guilty.
Carlos Kidd is charged with two counts of mailing threatening communications. Authorities say he mailed letters from Texas to U.S. District Judge Daniel Hovland in Bismarck.
Kidd is currently serving two prison sentences, including a 10-year term for escape and a 5-year term for harassment.
Arraignment for Kidd was held in Fargo last week. A trial date has not been set.
No further details were available.