something you can do. if nothing else, an opportunity to look at the evidence anew. >> reporter: wallace and lewin began by digging into the love triangle. by re-interviewing mary ann, asking about her relationship with both archie and yanos. and about the events that preceded the murder. >> typically, when these murders occur, behaviors start to fall apart. you see the behavior of the murderer become more and more aggressive and the murder occurs. >> reporter: so to the beginning, which was, of course, the love story or the betrayal, call it what you will. mary ann was frankly a little bored with archie. he loved her unreservedly. she knew that. but passion, excitement, not so much. she was a vibrant woman still and attractive. but 47 and in need of something. and then there he was, yanos. she met him at a local club. he was just 32, 25 years younger than archie. >> he was everything archie wasn't.