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he found his father dead in the driveway. >> there's no doubt in my mind what happened. i immediately knew. >> there was someone else who may have known, too. >> i turned around and looked at my mama, like you know who did this, that -- >> but there was one thing no one could no, the strange stream twists still to come. >> it was a bit of a surprise. >> kind of a shock. >> when they found out she was seen him again. >> a lovers triangle, always leads to trouble. >> how could you do such a horrible thing? you destroyed me. >> did this one lead to murder? >> what was your like watching...

shift was hurt last >> she was lying face down, a pool of blood under one side. >> just one tiny clue. >> a piece of foam rubber. >> there was a suspect, but he had an alibi, until this revelation. >> i said, i have something that you need to know. >> welcome to dateline, it >> hello, and welcome to dateline. it sometimes take especially to look at a crime scene and spot the one thing that is out of place, the clue that will crack the case. in this story, that thing appeared so inconsequential, that no one even knew what it was, let alone what it meant. it took almost two decades, a ...

>> i went and i touched him, i'll never forget that feeling. >> it was just before dawn when he found his father dead in the driveway. >> there's no doubt in my mind what happened. i immediately knew. >> there was someone else who may have known, too. >> i turned around and looked at my mama, like you know who did this, that -- >> but there was one thing no one could no, the strange stream twists still to come. >> it was a bit of a surprise. >> kind of a shock. >> when they found out she was seen him again. >> a lovers triangle, always leads to trouble. >> how could you do such a hor...

and her friends. >> she was extremely outgoing. >> a wonderful life that came to a tragic and on one warm summer night. >> i hear a very weird scream. >> her life had ended, but our story was just beginning. her killer hadn't been caught. >> i remember one detective saying to me, you just have to wait till because again. >> but the trail grew cold. the file forgotten, until decades later, someone dusted it off. >> the whole goal of these cases was to try and see the thing that's hiding in plain sight. >> there were clues. a mysterious weapon made of wire, the wedding invitation, a mi...

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...