sarah's protector. >> yes. that's how i felt. like i failed. >> and you were the last member of her family to say goodbye. >> yes. it's a big pill to swallow. >> you helped her get ready. >> for her night out. and i painted her nails. yes. >> you never could have known. >> you never know. you should always tell your loved ones you love them. you really don't know. >> his deep sorrow was clouded by anger and suspicion. now that the search for sarah was over, it was time to find her killer. so far detectives had made no arrests, but nick had his eye on someone. >> he was the only one that i just wanted to rip his heart out of him. coming up -- >> that's a big deal? >> tremendous deal.