⏱ 2 min read
A deadly dispute in Dupree, South Dakota, turned fatal when Gradyn Blue Arm, 27, stabbed a victim to death on June 3, 2025, within the Cheyenne River Sioux Indian Reservation. The incident occurred after Blue Arm was asked to leave a residence, but he returned armed with knives, argued with the victim, and eventually stabbed them in the abdomen. The victim died from their injuries. Blue Arm pleaded guilty on April 9, 2026, and was sentenced on July 13, 2026.
The case was investigated by the FBI and Cheyenne River Sioux Tribe Law Enforcement Services, and prosecuted by Assistant U.S. Attorney Wayne Venhuizen. The Major Crimes Act mandated that the case be prosecuted in federal court due to its occurrence in Indian country.
Blue Arm was sentenced to 12 years in federal prison, followed by three years of supervised release, and ordered to pay a $100 special assessment to the Federal Crime Victims Fund. He was immediately remanded to the custody of the U.S. Marshals Service.
The sentencing brings closure to the case, but the community is left to grapple with the consequences of the violent crime. The incident highlights the need for continued cooperation between law enforcement agencies to address violence in Indian country.
📋 Key Facts
- Crime: Violent Crime
- Defendant: South Dakota
- Location: SD
- Source: DOJ Press Release
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