with rob dixon in the clear, what about paige's first husband, ron biegler? >> he was absolutely the last person who spoke to her. >> dan rubenstein is a prosecutor with the mesa county district attorney's office. >> so obviously an ex-husband you want to look at. >> but when he last spoke to paige at 8:57 p.m., biegler was in denver, a four-hour drive away. >> we got a lot of information from him, and we were able to eliminate him as a suspect >> bieglor told detectives everything he knew about paige. including what she told him she was going to do after that picnic of theirs, a secret late-night business trip. business trip? well. investigators couldn't find paige bergfeld, but they found her secrets. that business of hers was about to rock the whole town. >>> coming up -- a revelation that would blow the case and the suspect list wide open. >> paige was living a double life. >> and then, investigators recover paige's date book and an unnerving clue. a day planner. >>> a missing persons case can be a complicated affair, far more than a typical homicide inve