Mission Man Sentenced to Federal Prison for Assaulting a Federal Officer

PIERRE - United States Attorney Ron Parsons announced today that U.S. District Judge Eric C. Schulte has sentenced a man from Mission, South Dakota, convicted of Assaulting, Resisting, and Impeding a Federal Officer.  The sentencing took place on November 12, 2025.

Shannon Dunham, age 38, was sentenced to eight months in federal prison, followed by three years of supervised release, and ordered to pay a $100 special assessment to the Federal Crime Victims Fund.

Shannon Dunham was indicted by a federal grand jury in November 2024.  He pleaded guilty on August 7, 2025.

The conviction stems from an incident that occurred in October of 2024, in the Rosebud Sioux Indian Reservation, wherein a Rosebud Sioux Tribe Law Enforcement Services officer was dispatched to a residence in Mission based on a report that Dunham was causing a disturbance. Upon arrival at the residence, the officer contacted Dunham, who was verbally aggressive, grabbed the officer, and brandished a knife at him.  Dunham was subsequently arrested.

This case was investigated by the Rosebud Sioux Tribe Law Enforcement Services.  Supervisory Assistant U.S. Attorney Kirk Albertson prosecuted the case.

Dunham was immediately remanded to the custody of the U.S. Marshals Service.