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who did she see? just want to know what happened to my sister. >> a young mother is missing and a case gone cold. >> it was so important to me to know the truth behind that evening. >> then, detectives had and aha moment to solve the case, they return to something you probably use every day. facebook. >> why don't you establish a facebook account? i thought that could accomplish a great deal. >> and that's when everything started to change. >> something happened to her. >> in court, you'll see it all come pouring out. a hidden crime and a son's heart pounding moment. >> this is a hor...

>> a young mother is missing and a case gone cold. >> it was so important to me to know the truth behind that evening. >> then, detectives had an aha moment to solve the case, they return to something you probably use every day. facebook. >> why don't you establish a facebook account? i thought that could accomplish a great deal. >> and that's when everything started to change. >> something happened to her. >> in court, you'll see it all come pouring out. a hidden crime and a son's heart pounding moment. >> this is a horrible crime. >> i'm glad we know the truth. ♪ ♪ ♪ >> carol...

Me a -- few minutes or few days o i'll cooperate when i come back. >> but when he came back, he did not give them anything and they were right back where they started. suspicion, sure, but no evidence of a crime. no way to even prove carroll was dead. jim wallace was a detective who finally hit on the idea, to use a tool that did not exist when carroll left her husband on march 1981. >> coming up, a dramatic turning case and fresh heartbreak for carroll's family. >> another night mount up of the first nightmare. >> when dateline continues. kids are so expensive, dad. now katie needs braces. ma...