DUPREE, SD – A heated argument turned fatal on a Dupree, South Dakota deck last September, and now Jaclyn Blue Coat will pay the price. The 26-year-old Eagle Butte woman received an 11-year federal prison sentence Friday, August 11, 2025, after pleading guilty to Voluntary Manslaughter.
According to court documents, Blue Coat stabbed the father of her children in the left upper chest during a dispute outside his Dupree residence, located within the Cheyenne River Sioux Indian Reservation. The attack proved fatal, triggering a federal investigation led by the FBI and the Cheyenne River Sioux Tribe Law Enforcement Services. She was initially indicted by a federal grand jury in November 2024 and entered a guilty plea on May 15, 2025.
U.S. District Judge Eric C. Schulte delivered the sentence, which includes three years of supervised release following her prison term. Blue Coat was also ordered to pay $100 to the Federal Crime Victims Fund. The case wasn’t handled by state authorities due to the Major Crimes Act, a federal law that gives the U.S. Attorney’s Office jurisdiction over specific violent crimes committed within Indian Country.
“This case underscores the serious consequences of violence, particularly within our tribal communities,” stated U.S. Attorney Alison J. Ramsdell in a press release. While the statement offers little detail about the specifics of the argument, sources close to the investigation suggest a long-simmering dispute fueled by custody issues and financial strain.
Assistant U.S. Attorney Wayne Venhuizen skillfully prosecuted the case, presenting evidence that left little doubt about Blue Coat’s involvement. The defense argued for a lesser sentence, citing Blue Coat’s difficult upbringing and history of trauma, but Judge Schulte ultimately deemed the severity of the crime warranted a significant term of imprisonment.
Blue Coat was immediately taken into custody by the U.S. Marshals Service following the sentencing. The family of the victim has yet to release a statement, but sources indicate they are relieved the legal process is complete, though the pain of their loss remains. This case serves as a stark reminder of the cycle of violence plaguing many communities, and the lasting impact it has on families and individuals.
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Key Facts
- State: South Dakota
- Agency: DOJ USAO
- Category: Violent Crime
- Source: Official Source ↗
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