⏱ 2 min read
Jonathan Sierra, a 22-year-old man from Parmelee, South Dakota, attacked a federal officer on the Rosebud Sioux Indian Reservation in July 2025. The incident occurred when a Rosebud Sioux Tribe Law Enforcement Services officer was speaking to Sierra’s ex-girlfriend at her residence in Mission, South Dakota. Sierra arrived at the scene, exited his vehicle with a knife, and was ordered to drop it. After eventually throwing the knife away, Sierra struggled with the officer and kicked him, as well as an assisting officer.
The case was investigated by the Rosebud Sioux Tribe Law Enforcement Services and prosecuted by Assistant U.S. Attorney Kimberly Zachrison. Sierra was indicted by a federal grand jury in January 2026 and pleaded guilty on April 1, 2026.
On July 6, 2026, U.S. District Judge Eric C. Schulte sentenced Sierra to time served, equivalent to approximately 10 months in custody, followed by 3 years of supervised release. Sierra was also ordered to pay a $100 special assessment to the Federal Crime Victims Fund.
Sierra’s actions led to a serious confrontation with law enforcement, resulting in his conviction and sentencing. The incident highlights the risks faced by federal officers in the line of duty.
📋 Key Facts
- Crime: Violent Crime
- Defendant: South Dakota
- Location: SD
- Source: DOJ Press Release
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