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Marty theer, but was he really the killer? coming up, a secret about john and michelle's steamy affair becomes very public. >> she was taking him to these sex clubs and saying, it's okay, go, you know, if you want to have sex with her, that's 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 don't have to buzz in. it's not a question, gary. on march 1, 1810 -- [ ding ] -frédéric chopin. -collapsing in 226 -- [ ding ] -the colossus of rhodes. -[ sighs ] ...

It's the end. this is good-bye. do you understand that? it's 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 isn't always. why don't 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 takes two people to quit the relationship. and yanos was just not going to accept it. >> when dead...

>> 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, there's 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 you've done? you've destroyed me. >> when deadly triangle continues. so i can take on my day. activia. now in probiotic dailies. with three extrairst absorb channels.r they stay up t...

>> the defense argued the evidence was thin. no blood, no murder weapon. no witnesses. and dna found under archie's 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 around, looked at my mom, and said i can't believe [bleep] you know exactly what. she goes, i'm so...

If he didn't 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 twist still to come. >> it was a bit of a surprise. kind of a shock when you found out she was seei...