A condemned killer trying to delay his execution because of his extreme weight hasn't raised enough new issues to warrant the legal challenge, a federal judge ruled Monday.

Death row inmate Ronald Post, who weighs more than 400 pounds, is asking the courts to stop his January execution on the grounds his weight could cause him to suffer severe pain during the procedure.

Post is prohibited from challenging his execution by injection because he raised similar claims in his first set of federal appeals in 1997, Judge Lesley Wells said Monday in Cleveland.