IOP § III(C): Voluntary Dismissals
Rules of Appellate Procedure and Internal Operating Procedures of the Eighth Circuit — Internal Operating Procedures: III. Presubmission Appellate Process
When a notice of appeal has been filed but the appeal has not been docketed, the district court may dismiss the appeal if a stipulation for dismissal signed by all the parties is filed or if the appellant moves for dismissal. See FRAP 42(a). Once the appeal has been docketed in the court of appeals, the district court loses jurisdiction to dismiss the appeal, and the dismissal must be directed to the court of appeals. Dismissal by the court of appeals is governed by FRAP 42(b).
In a criminal case, the defendant must personally sign a written consent to the dismissal. See 8th Cir. R. 42A.