FARGO, N.D. (AP) -- An Indiana prison inmate accused of mailing a threatening letter to a dead federal judge in North Dakota has signed a plea agreement in federal court.
Michael Howard Hunter is charged with mailing threatening communications.
Hunter is an inmate at the New Castle Correctional Facility in New Castle, Ind.
Authorities say Hunter sent a letter postmarked Dec. 12, 2012, addressed to Judge Rodney Webb at the Cass County Courthouse in Fargo.
Webb died in August 2009.
The letter from Hunter allegedly contained threats to Webb and three federal prosecutors.
Hunter has an extensive criminal background that includes bank robberies in Indiana and Washington State.
The charge carries a maximum sentence of 10 years in prison.