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done it, her boyfriend? her ex? >> he was very obsessed with angie. >> the trail went cold for more than two decades. but she was sure she knew who the killer was, even got a private detective license to help prove it. >> i said, i'm a private investigator, and i need you to tell me where is the evidence, all of that. it wasn't well received at all. >> finally, the break they needed. >> we got the match. >> leading to one of the greatest twists of all time. >> it could not have shocked me more.? >> hello and welcome to "dateline. " when angie samota walked into a room, people noticed...

Back in the mid'80s, that wasn't the help it would be today. >> back in 1984, that could do a type of blood testing to determine whether or not an individual is a secreter or non-secreter. >> roughly 80% of americans are secreter, meaning they have markers for their blood type. the killer was a non-secreter? >> that's correct. >> blood tests revealed dance was a secreter. in addition, lance had an alibi, putting him 370 mile ace way. >> he was staying with his parents in amarillo, working with at the gym there. >> so he was eliminated based