Bob Orton , Randy 's father and ringside manager , interfered and attacked Undertaker with his arm cast resulting in Randy Orton gaining control of the match . Undertaker attempted to chokeslam Orton , but Orton countered the maneuver with an RKO that led to a two-count . before WrestleMania , Orton 's father , `` Cowboy '' Bob Orton , begged the Undertaker to have mercy on Orton .