Source: US FBI
United States Attorney Lesley A. Woods announced that Mongecka (aka “Monga”) Eastman, 24, originally of South Dakota, was sentenced on May 15, 2025, in federal court in Omaha, Nebraska, for assault resulting in serious bodily injury and sexual abuse without consent. United States District Court Judge Brian C. Buescher sentenced Eastman to 120 months’ imprisonment on the assault case, to run concurrent with the 120-month sentence imposed by Judge Buescher in the sexual abuse case. There is no parole in the federal system. After Eastman’s release from prison, he will begin a 3-year term of supervised release on the assault case to run concurrent with a 10-year term of supervised release on the sexual abuse case.
In February 2021, Eastman subjected a minor female to a sexual act without her consent. Eastman entered the minor female’s bedroom in Santee, Nebraska, while she was changing her clothes. Eastman then forced himself on the minor victim, twisting her arm to the point of pain and pinning her to a bed before sexually assaulting her. The minor victim later disclosed the sexual assault to a trusted adult, who notified law enforcement.
In September 2023, Eastman seriously assaulted an adult male victim in multiple rural locations on the Santee Sioux Nation Indian Reservation, using a minor to assist him in committing the offense. Eastman and the minor hit and kicked the victim, and Eastman repeatedly slammed the victim onto the hood of a vehicle, leaving dents in the metal. The victim sustained serious bodily injuries from the assault which required emergency medical care and hospitalization, including injuries to his liver and nose, a concussion, and a subdural hemorrhage.
These cases were prosecuted in federal court because the offenses are felonies which occurred on the Santee Sioux Nation Indian Reservation in Nebraska.
This case was investigated by the Federal Bureau of Investigation.