LINCOLN, Neb. (AP) — The Nebraska Supreme Court has upheld a lower court’s dismissal of post-conviction claims by an Omaha man sentenced to life for the 2000 killing a 19-year-old college student.

Richard Cook was convicted of first-degree murder in the killing of Amy Stahlecker, who was killed after her car suffered a flat tire west of Omaha. Stahlecker’s bullet-riddled body was found under an Elkhorn River bridge.

The high court on Friday affirmed a lower court’s refusal to hold an evidentiary hearing for a slew of claims by Cook. Among those claims was that former Douglas County crime lab chief David Kofoed planted evidence in Cook’s case.

Kofoed was convicted in 2010 of evidence tampering in an unrelated murder case.

The high court said Cook offered no facts to back up the claims.