Benjamin J. Jones appeals the district court’s order revoking his supervised release on the basis that he committed attempted murder and was a felon in possession of a firearm during his term of supervised release. This court reviews a district court’s revocation of supervised release for abuse of discretion. United States v. Copley, 978 F.2d 829, 831 (4th Cir. 1992).

We have reviewed the record and find no reversible error. A violation of a condition of supervised release must be proved by a preponderance of the evidence. See 18 U.S.C.A. § 3583(e)(3) (2000); Johnson v. United States, 529 U.S. 694, 700, 120 S.Ct. 1795, 146 L.Ed.2d 727 (2000). A state conviction for the underlying conduct is not required, and the district court’s finding of witness credibility in the revocation hearing is not reviewable. See U.S. Sentencing Guidelines Manual § 7B1.1, comment, (n.1) (2002); United States v. Saunders, 886 F.2d 56, 60 (4th Cir. 1989).

*376 Accordingly, we affirm the district court’s judgment revoking Jones’s supervised release. We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

AFFIRMED