but whoever took paige could not have been rob dixon. couldn't have been.ause that phone call at 7:42 p.m. pinged off a cell tower in philadelphia 2,000 miles away. with rob dixon in the clear, what about paige's first husband ron beigler? >> he was actually the last person who spoke to her. >> reporter: dan rubinstein is a prosecutor with the mesa county district attorney's office. >> so obviously, an ex-husband you want to look at. >> reporter: but when he last spoke to paige at 8:57 p.m., beigler 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 fairly early on. >> reporter: beigler 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 birgfeld, 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. >> paig