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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...

To stay in prison for the rest of his life and never get out. >> the trial finally began 2007. 23 years after robbyn's murder. william marshall is now 46. he arrived in court each day carrying a bible. it is troubled youth, early drug addiction, rap sheet for decades behind him, this was a man who looked capable of cold blooded murder. he said nothing. just watch prosecutor john lewin make the case against him. >> william marshall knew before he walked into the restaurant that night, he knew robbyn knew him. so, he knew that if he was going to give this crime, he was going to kill her. so, thi...