GREAT FALLS – A man from Browning today admitted to murdering a man and holding a woman hostage with a knife point on the Blackfeet Indian Reservation, Acting U.S. Attorney Leif Johnson said.
Jason Avery Mattson, 30, has pleaded guilty to second degree murder and kidnapping, as charged in an indictment. Mattson faces a maximum sentence of life in prison, a fine of $ 250,000 and five years of supervised release.
Chief Justice of the United States, Brian M. Morris, presided. Chief Justice Morris has set the sentence for June 24. Mattson was arrested.
In court documents filed in the case, the government alleged that on March 3, 2020, law enforcement was called to the Blackfeet Indian Reservation after a body was found, which showed signs of homicide. . The body has been identified as John Doe. An autopsy confirmed the death was homicide, with evidence of blunt injuries.
Further, the government alleged that on March 10, 2020, Mattson called the Blackfeet Law Enforcement Services, confessed to killing John Doe, and told the expedition he had a knife and a gun. As officers responded to the residence, Mattson called back and told the dispatch team that he was holding a hostage, identified as Jane Doe, at knife threat. Mattson threatened to kill Jane Doe and held her hostage for about four hours before she could escape. Mattson was taken into custody.
Assistant U.S. Attorney Kalah Paisley is pursuing the case, which has been investigated by the FBI, the Bureau of Indian Affairs and the Blackfeet Law Enforcement Services.