 Orton then produced a copy of SmackDown ! magazine , which featured The Undertaker on the cover . Heeding Graham 's advice , Orton claimed he would set himself apart from all other wrestlers by ending The Undertaker 's undefeated streak at WrestleMania . Throughout March 2005 , Orton taunted The Undertaker , claiming he was unafraid of him . On the March 21 Raw , Orton turned into a villain once more after he delivered an RKO to his unsuspecting on @-@ screen girlfriend , Stacy Keibler , knocking her unconscious . During Orton 's promos , he ran for cover whenever signs of The Undertaker 's appearance ( lightning , darkness , or smoke ) occurred . When legendary wrestler Jake Roberts advised Orton not to underestimate The Undertaker , Orton performed an RKO on Roberts as well . In the weeks leading up to WrestleMania , Orton became more defiant and unafraid of The Undertaker , taunting and assaulting him in the ring following distractions from his father , " Cowboy " Bob Orton . At WrestleMania 21 , however , the heavily hyped match was unsuccessful for Orton , as he lost despite his father 's interference . 
