Dupree Man Sentenced to 12 Years in Federal Prison for Voluntary Manslaughter
Gradyn Blue Arm, 27, of Dupree, was sentenced to 12 years in federal prison after pleading guilty to voluntary manslaughter in connection with a fatal stabbing.
4 reports on this incident · first at Aug 19, 2026, 4:24 p.m. ET
Earlier reports
Aug 24, 2026, 11:55 a.m. ET
Dupree Man Sentenced to 12 Years in Federal Prison for Voluntary Manslaughter
Gradyn Blue Arm, 27, of Dupree, was sentenced on August 19, 2026, to 12 years in federal prison, followed by three years of supervised release, and ordered to pay a $100 special assessment, according to the U.S. Attorney's Office for the District of Arizona. Blue Arm had pleaded guilty to voluntary manslaughter.
According to the U.S. Attorney's Office, Blue Arm stabbed the victim in the abdomen with a knife, resulting in the victim's death. The incident occurred on the Cheyenne River Sioux Tribe. The FBI and the Cheyenne River Sioux Tribe Law Enforcement Services conducted the investigation.
The case was prosecuted by the U.S. Attorney's Office for the District of Arizona. The sentencing was announced on August 24, 2026.
Aug 24, 2026, 11:52 a.m. ET
Dupree Man Sentenced to 12 Years in Federal Prison for Voluntary Manslaughter
Gradyn Blue Arm, 27, of Dupree, was sentenced to 12 years in federal prison, followed by three years of supervised release, and ordered to pay a $100 special assessment, according to the U.S. Attorney's Office. The sentence was announced on August 24, 2026.
Blue Arm previously pleaded guilty to voluntary manslaughter. The charge stemmed from an incident on August 19, 2026, in which Blue Arm stabbed the victim in the abdomen with a knife, resulting in the victim's death, according to the U.S. Attorney's Office.
The FBI and Cheyenne River Sioux Tribe Law Enforcement Services investigated the case. The U.S. Attorney's Office for the District of Arizona handled the prosecution.
Aug 19, 2026, 4:24 p.m. ETFirst report
Tucson Man Sentenced to 87 Months for Voluntary Manslaughter
According to official court records released by the U.S. Attorney's Office for the District of Arizona on August 19, 2026, Santiago Luis Valencia, Jr., 36, of Tucson, has been sentenced to 87 months in prison for voluntary manslaughter. Chief United States District Judge Jennifer G. Zipps delivered the sentence following Valencia's previous guilty plea. Officials note the case remains an open and developing matter.
Official records state that on June 15, 2024, Valencia initiated a physical altercation and assaulted the victim at a private residence on the Pascua Yaqui Tribe. During the fight, the victim sustained a head injury and died the next day. Both Valencia and the victim were enrolled members of the Pascua Yaqui Tribe.
The investigation was conducted jointly by the FBI Phoenix Division's Tucson office and the Pascua Yaqui Police Department. The prosecution was handled by the United States Attorney's Office, District of Arizona, Tucson, under case number CR-24-04265-TUC-JGZ.
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