Trevin Antonio of Eagle Butte, South Dakota, was sentenced on July 13 to three years and six months in federal prison after being convicted of assault resulting in serious bodily injury. United States Attorney Ron Parsons announced the sentencing by U.S. District Judge Eric C. Schulte, which also includes three years of supervised release and a $100 special assessment to the Federal Crime Victims Fund.
Antonio, age 29, was indicted in October 2025 and pleaded guilty on April 9, 2026. The conviction stems from an incident on July 31, 2025, when Antonio assaulted a woman with a weapon within the Cheyenne River Sioux Indian Reservation. The victim sustained severe lacerations to her face that required hospitalization.
According to the announcement, “This matter was prosecuted by the U.S. Attorney’s Office because the Major Crimes Act, a federal statute, mandates that certain violent crimes alleged to have occurred in Indian country be prosecuted in federal court as opposed to State court.” The case was investigated by the Federal Bureau of Investigation and Cheyenne River Sioux Tribe Law Enforcement Services. Assistant U.S. Attorney Wayne Venhuizen prosecuted the case.
The U.S. Attorney for the District of South Dakota is responsible for enforcing federal laws and advancing community safety throughout its district as well as handling both criminal prosecutions and civil cases, according to the official website.
Antonio was immediately remanded into custody by the U.S. Marshals Service.