Deadly Triangle News Today

Marty theer, but was he really the killer? coming up, a secret about john and michelles steamy affair becomes very public. >> she was taking him to these sex clubs and saying, its okay, go, you know, if you want to have sex with her, thats fine and he just, wow, okay. >> when "deadly triangle" [ ding ] -oh, i have progressive, so i just bundled everything with my home insurance. saved me a ton of money. -love you, gary! -you dont have to buzz in. its not a question, gary. on march 1, 1810 -- [...

Its the end. this is good-bye. do you understand that? its good-bye forever. >> reporter: that was that. but, of course, you know how it is with lovers, ex or otherwise. what may sound like the end isnt always. why dont we check back in, say, 20 years. >> coming up, a new detective and a new prosecutor turn up the heat and suddenly a cold case is red hot again. >> as soon as i looked at it, i sa, this guy is goodor this murder. yanos truly loved her. love boring on obsession unfortunately, it ta...

>> reporter: about that on that crisp december morning as gary and his mother stood shivering 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, theres no doubt in my mind what happened. >> coming up, there was someone else who also seemed to know who the killer was. >> how could you do this? do you know what youve done? youve destroyed me. >> when deadly triangle continues. so i can take on...

>> the defense argued the evidence was thin. no blood, no murder weapon. no witnesses. and dna found under archies finger nails, it had now been determined, did not match janos. >> even if everybody right away things that janos kulcsar is the killer, there has to be proof beyond a reasonable doubt. >>, of course, gary mcfarland had no doubt he killed archie. he told the jury about that awful defense morning when he discovered his dad dead on the driveway and new instantly who did it. >> i turned...

If he didnt like it, he could leave. >> he had been stabbed multiple times. nobody saw anything. >> i went, dad. and i touched him. 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 ...

Something is there but its not blood. >> reporter: now two decades since archies murder, wallace found yanos clothes. they were still in the evidence locker. he sent them to the crime lab for retesting. once again, there wasnt 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 pa...

But he was the only man in her life since archie was murdered. >> she loves janos and does not want to believe hes a killer. >> the case against janos kulcsar finally came to court, and, of course, the prosecutions 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. >> im so sorry. im so sorry, son. and she...

>> reporter: now two decades since archies murder, wallace found yanos clothes. they were still in the evidence locker. he sent them to the crime lab for retesting. once again, there wasnt 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, thats when the lightbulb went off...

Strange. >> one of the stab wounds was in the groin area. >> reporter: what did that tell you? >> its 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, theres no doubt in my mind wh...

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 lovers...