lauderdale, the day the mystery began, when a young man named david jackson failed to meet his brother mark at the airport. >> it was a gut feeling that something was wrong and i knew it. >> 15 years later, donna relived that puzzling time. david's ex-wife barbara, by then remarried and living in arizona, got a call from david's worried mother. barbara says she wasn't worried. not then. >> i thought, well, okay, he was with one of his girlfriends and she said, we're doing a missing person's report and i said, no, he's going to call me in a couple of days just like he always does and he never called. he never called. >> one day turned into the next. police, family, everybody tried to find him. but couldn't. >> started looking, searching, canals, pipes, little bridges on dirt roads, anywhere, a car that