. >> this person of interest, ron beigler, was paige's first ex-husband.they married right out of high school. young, immature, and soon, divorced. but, funny how this works. ten years had sanded off their sharp edged disputes, and they saw anew why they fell in love. >> it seemed like as if no time had passed at all. >> this is ron beigler, talking to a "dateline" producer soon after paige's disappearance. >> at what point did you start to rekindle your relationship? >> about six months ago. we tried to take it slow, but there was -- there was no denyin'that -- that it was just as it was before. >> problem was biegler lived in denver, a 4-hour drive east. so the two lovers would often meet at some midway point. on the day of paige's disappearance they chose eagle, colorado. >> we were going to have a picnic and hang out together, all day. we went to subway and brought it back to where we were sitting outside down by the river. it was very familiar. and, you know, i brought some pictures, you know? and we just sat there and relaxed and enjoyed the day and