10th Cir.

United States v. Lynn

June 30, 2026 ·25-5027 ·Panel Decision ·Kelly · By James Taylor

The Tenth Circuit affirmed the admission of tribal enrollment records and self-defense instructions but reversed the first-degree murder conviction due to a jury instruction error. The court remanded the case with instructions to vacate the murder conviction and conduct further proceedings.

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Background

Defendant Cameron Lynn was convicted by a jury in Indian country of first-degree murder, assault with a dangerous weapon, using a firearm during a crime of violence, and assault resulting in serious bodily injury. The underlying incident involved a shooting at a homeless encampment in Tulsa, Oklahoma, where one person was killed and another injured. Lynn argued on appeal that the district court erred in admitting a tribal database screenshot, in its self-defense instruction, and in failing to instruct the jury that the government must disprove imperfect self-defense beyond a reasonable doubt.

The court’s reasoning

The court held that the tribal database screenshot was admissible under the business records exception and did not violate the Confrontation Clause. It further found that the self-defense instruction including a factor regarding the duty to retreat was a correct statement of law. However, the court agreed with Lynn that the district court erred by failing to instruct the jury that the government must disprove imperfect self-defense beyond a reasonable doubt. This error was not harmless because the district court had already determined that sufficient evidence existed to warrant an imperfect self-defense instruction.

What it means going forward

The ruling clarifies that while tribal records are generally admissible as business records, the government bears a strict burden to instruct juries that imperfect self-defense must be disproven beyond a reasonable doubt in murder cases. This decision requires retrials or resentencing for murder convictions where such an instruction was omitted.