Parmelee Man Sentenced for Assaulting a Federal Officer

PIERRE - United States Attorney Ron Parsons announced today that U.S. District Judge Eric C. Schulte has sentenced a Parmelee, South Dakota, man convicted of Assaulting, Resisting, and Impeding a Federal Officer. The sentencing took place on July 6, 2026.

Jonathan Sierra, age 22, was sentenced to time served through August 7, 2026, equal to approximately ten months in custody, followed by three years of supervised release, and ordered to pay a $100.00 special assessment to the Federal Crime Victims Fund.

Sierra was indicted by a federal grand jury in January 2026. He pleaded guilty on April 1, 2026.

The conviction stems from an incident that occurred in July 2025, within the Rosebud Sioux Indian Reservation. On the date of the event, a Rosebud Sioux Tribe Law Enforcement Services Officer was speaking to Sierra's ex-girlfriend at her residence in Mission, South Dakota. Sierra drove up to the house, and the officer asked Sierra to get out of his vehicle. Sierra exited the vehicle with a knife in his hand. The officer repeatedly commanded Sierra to put the knife down. Eventually, Sierra threw the knife into the street. When the officer tried to detain Sierra, Sierra began to struggle and kicked the officer. Sierra also kicked an assisting officer during the struggle.

This case was investigated by Rosebud Sioux Tribe Law Enforcement Services. Assistant U.S. Attorney Kimberly Zachrison prosecuted the case.

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