A federal appeals court has dismissed an appeal filed by a Wyoming woman convicted of murdering her husband nearly 30 years after he was shot to death.

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Rita Ann Humphrey had argued that her second-degree murder conviction in Wyoming courts in 2006 for the 1977 shooting death of her husband had violated her constitutional right to a speedy trial.

The Associated Press reports that a three-judge panel of the 10th circuit court of appeals in Denver on Wednesday dismissed Humphrey's appeal. The ruling states that she failed to show that the Wyoming Supreme Court violated federal law in upholding her convictions.

Humphrey is serving a prison sentence at the women's prison in Lusk.