1984 Without News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> 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...

Scene, wouldn't that exclude marshall as a suspect? the detective protested that the ballots had been stored in a plastic and hear all those years. to the scientists, all she could say that those two but the phone did not share the same a chemical signature. >> to hear her say that, one has valid someone doesn't, someone has to explain this. >> i have to tell you, it was devastating. >> not your best day. >> not the best. it really was the piece that we needed. something more than we had from 1984. without the connection to that boot, i don't think we relate a case. >> coming up, investigators...

Everything in plastic bags to containers. if that turned up in the foam on marshall's boots but not in the foam at the crime scene, wouldn't that exclude marshall as a suspect? the detective protested phthalates must have gotten in the boots because they were stored in a plastic container all those years. but to the scientists, facts are facts, those two pieces of foams did not share the same chemical signature. >> to hear her say one has phthalates and one doesn't, i have to tell you, it was devastating. >> not your best day. >> not the best day. because it was the piece we needed to do somet...

Marshall as a suspect? the detective protested they must have gotten in the boots because they were stored in a plastic container all those years. but to scientists, facts are facts, those two pieces of foams did not share the same chemical signature. >> to hear her say one has phalates and one doesn't, i have to tell you, it was devastating. >> not your best day. >> it was what we needed to do something more from 1984. without that connection to the boots i don't think we have a case. coming up, investigators make one last-ditch efforts to talk to their experts. they track them down here le...