There's also the possibility that the show just wants us to think that season 5's brand-new victim is Laurel. It could be someone else entirely. My personal theory is that it is Laurel's mother, Sandrine (Lolita Davidovich), who perhaps wanted to kidnap baby Christopher to punish the daughter that may or may not have tried to kill her back in season 4. Frank loves Laurel and her baby, and in the season 5 opener even told her that he would do anything to protect them both. Frank treats murder a little more casually than the rest of us do, so, you know, that's not a promise to take lightly.