Mission Man Sentenced to 15 Years in Federal Prison for Voluntary Manslaughter and Assault with a Dangerous Weapon

PIERRE - United States Attorney Alison J. Ramsdell announced today that U.S. District Judge Eric C. Schulte has sentenced a man from Mission, South Dakota, convicted of Voluntary Manslaughter and Assault with a Dangerous Weapon. The sentencing took place on August 19, 2025.

Eric Roubideaux, II, age 21, was sentenced to 15 years in federal prison for Voluntary Manslaughter and 10 years in federal prison for Assault With a Dangerous Weapon, with the sentences to be served concurrently, followed by three years of supervised release. Roubideaux was further ordered to pay a $200 special assessment to the Federal Crime Victims Fund.

Roubideaux was indicted by a federal grand jury in August 2024. He pleaded guilty on May 19, 2025.

In the early morning hours of July 7, 2024, within the Rosebud Sioux Indian Reservation, Roubideaux was with family members at a residence in Mission, South Dakota. Roubideaux became angry and attacked a family member with a garden hoe and kicked and stomped her with shod feet. He then fled the residence. The family member suffered injuries that included a concussion and a laceration to her scalp that required medical attention. After he fled the residence, Roubideaux came upon a man walking along the street and confronted him. Roubideaux attacked the man with a stick and knocked him to the ground. Roubideaux then kicked and stomped the man with shod feet, including repeatedly kicking the man in the head. Roubideaux fled the scene, but he was arrested a short time later. The man suffered fatal blunt force trauma injuries.

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.

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

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