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>> there was a suspect, but he had an alibi, until this revelation. revelation >> i said, i have something that you need to know. >> welcome to dateline, it sometimes takes a special eye to look at a crime scene and spot the one thing that is out of place. the clue that will crack the case. and in this story, that thing appeared so inconsequential, no one even knew what it was, alone would've meant. it took almost two decades of a team of determinant investigators and a detective was than usual back out to find out. here is keith morrison with the night before halloween. >> it was th...

You know, jim saw it and then we took it to the fbi. >> the fbi crime lab in virginia, where the phone from marshals boot and the foam from the kfc would be compared to confirm they matched. it was obvious to detective that they did. a test, really, was just illegal routine. no problem. >> i can remember getting the call from the fbi analyst. my expectation was that she was gonna tell us, i have a match. >> and? it was like a needle going through a balloon. there was a problem. >> she was not willing to say. i can't say with any certainty that this is from the same ship because, let's face it,...