BOSTON — A federal inmate who sent threatening letters to an employee at the John Joseph Moakley U.S. Courthouse in Boston has been sentenced to three years in prison, the U.S. attorney's office for the District of Massachusetts said Tuesday.

Devin James Melycher, 34, was sentenced Nov. 3 in federal court in Boston by U.S. District Judge Myong J. Joun, prosecutors said. The prison term will be followed by three years of supervised release.

Melycher pleaded guilty in May to three counts of mailing threatening communications, according to the U.S. attorney's office. A federal grand jury indicted him in May 2024.

Prosecutors said Melycher sent letters addressed to a U.S. official at the Boston courthouse on three occasions, Dec. 16, 2022, Jan. 3, 2023, and Jan. 12, 2023, threatening to injure the employee.

Melycher has been in the custody of the federal Bureau of Prisons since 2023, the office said. The release did not say why he was in federal custody, where he is being held or what the letters said.

The U.S. Marshals Service took part in announcing the sentence.

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