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Little obsessed. he had many other more pressing cases, but something kept pulling him back to carol lubon. >> i actually would shove some of my work away. i got in a little trouble for that sometimes. >> for years the detective chipped away until finally, in 2010, eight years after he found that musty old blue file, he decided to pay a surprise visit to mike lubon. his colleagues thought he was nuts. >> there were those that thought, you think he's going to admit it to you? well, i played enough sports in my time. i know you'll not get anywhere if you don't try. >> detective delsigne. we want...

Welcome back. detective walt delsigne could not let go of the carol lubon cold case. after the california mom disappeared, police found no evidence of a crime. but over the years, carol's husband mike had made a few slight changes to his story about the night his wife vanished. now the detective was determined to dig into those inconsistencies. and mike was about to share a chilling new detail. what he told investigators would send the case into overdrive. here's keith morrison. >> for eight years, torrance police detective walt delsigne worried away at the carol lubon file, drawn by an irresi...

Gayle. >> she would have not taken all of it. that was in carol's personality to just be very fair. >> made sense then? >> uh-huh. >> and then there were those mysterious phone calls. >> we'd get the calls on special days. her birthday, my birthday. my grandmother. we'd get calls. >> and just silence on the other end? >> yeah. >> what would you do? >> we'd say, carol, we love you. we hope you come back. we felt like she was finding a happier life somewhere. >> and understood that to make that successful she might have to make a complete and total break? >> yeah. >> almost three months after ca...

Kerry. brought her into the fold. >> we were happy that mike was going on with life. >> and so they did all go on with life. and many years went by. until the morning in a whole new millennium when a torrance detective happened on the case of the missing young mother. and somewhere in the back of his brain, a little light turned on. >> i just had a hunch that this just didn't sound right to me. >> decades after carol's disappearance, detectives turned to a surprising source to help solve the mystery. coming up -- >> why don't you establish a facebook account for carol. >> when "secrets in th...

Months later, the local paper did a story, interviewed mike. and this time his memory was slightly different. he remembered that on that terrible morning when carol left, he heard the garage door go up before she drove away. just one more little detail, though nothing profoundly different. and, of course, no evidence whatsoever of any crime. the case went away again. and then one day in 2002, a detective named walt was rummaging through some cabinets behind his sergeant's desk. >> i was just being nosy. what is this? it was the carol lubon case folder. at that point, more than 20 years old and...