A state prison inmate has been convicted of threatening judges and other law enforcement officers.

U.S. Attorney Barry Grissom said in a news release Friday that 49-year-old Virgil E. Dillon was found guilty of seven counts of sending threatening letters. He was an inmate at the state prison in Lansing at the time he sent the letters.

Sedgwick County officials who received the letters included District judges Benjamin Burgess and David Kaufman and sheriff’s deputies Robert Clark and Tim Myers. Dillon also sent the letters to some federal agents.

Sentencing is set for April 18.