miriam taveras. tavares told the cops she looked out her window and saw it all.hers smack in the middle of the cab driver robbery that ended in murder. is it possible that miriam saw you commit a crime? >> no. >> reporter: not any crime? >> i wasn't there. >> reporter: bad blood between you and miriam? >> yes, bad blood. >> reporter: eric says he had a brief sexual relationship with miriam that did not end well. >> you have a fling with a girl, then you just cut it off abruptly. she may feel slighted. >> reporter: slighted enough to make you a murder -- >> i guess. >> reporter: -- suspect? >> i guess so. >> reporter: whatever her motivation, the question is how reliable was she as a witness? all these years later, eric finally had someone to take another look at miriam's story, attorney peter cross. >> there's no doubt that this woman was lying. i went out to the crime scene. she could not possibly have seen what she said occurred. >> reporter: so what could miriam tavares really see? here's the problem with miriam's story. from that police video, we know the cab