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Something is there but it's not blood. >> reporter: now two decades since archie's murder, wallace found yanos' clothes. they were still in the evidence locker. he sent them to the crime lab for retesting. once again, there wasn't a spec of blood on the clothes. but there was something on those pants. yanos had supposedly washed them and hung them up to dry. but still, there it was, something very strange. dirt and mud stains all over the pants. when i saw the report he said there was dirt on the pants, that's when the lightbulb went off. >> caught on tape. caught in a lie. >> this is somethin...

But he was the only man in her life since archie was murdered. >> she loves janos and does not want to believe he's a killer. >> the case against janos kulcsar finally came to court, and, of course, the prosecution's star witness was mary ann mcfarland. what did she know and what would she admit? could her testimony sink her lover or maybe save him? >> coming up, tough questions. >> let me make it very simple. are you in love with him? >> and raw emotions. >> i'm so sorry. i'm so sorry, son. and she went hysterical. she lost it. >> when deadly triangle continues. . and now with the conclusio...

>> reporter: now two decades since archie's murder, wallace found yanos' clothes. they were still in the evidence locker. he sent them to the crime lab for retesting. once again, there wasn't a spec of blood on the clothes. but there was something on those pants. yanos had supposedly washed them and hung them up to dry. but still, there it was, something very strange. dirt and mud stains all over the pants. when i saw the report he said there was dirt on the pants, that's when the lightbulb went off. >> caught on tape. caught in a lie. >> this is something you arranged with your brother? >> ye...

Strange. >> one of the stab wounds was in the groin area. >> reporter: what did that tell you? >> it's personal. >> reporter: kind of like somebody sending a message? >> yes. >> reporter: maybe a sexual message? >> yes. >> reporter: about that on that crisp december morning as gary and his mother stood shifvering and sobbing, the realization hit. >> i turned around and looked at my mom. i go, you know who did this. i just -- i immediately knew. i just -- it was like, there's no doubt in my mind what happened. >> coming up, there was someone else who also seemed to know who the killer was. >> h...

I will never forget that feeling. >> it was just before dawn when he found his father dead in the driveway. >> there was 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 mom. i go, you know who did this. that son of a -- >> there was one thing no one could know. the strange twist still to come. >> it was a bit of a surprise. kind of a shock when you found out she was seeing him again. >> yes. >> a lover's triangle always leads to trouble. >> how could you do such a horrible thing? >> did this lead to m...