this man decided, came to the conclusion that archie mcfarland was in his way and needed to die. >> thergued the evidence was thin. no blood, no murder weapon. no witnesses. and dna found under archie's fingernails, it had now been determined, did not match janos. >> even if everybody right away thinks that janos kulcsar is the killer, there has to be proof beyond a reasonable doubt. >> of course, gary mcfarland as you know had no doubt janos killed archie. he told the jury about that awful december morning when he discovered his dad dead on the driveway and knew standly who did it. >> i turned around, looked at my mom, and said i can't believe [ bleep ] you know exactly who did it. she goes, i'm so sorry. i'm so sorry. i can't believe he'd do this. i'm so sorry, son. she was just -- she went hysterical. she lost it. >> so difficult to rein in the emotion, even all these years later. easier for gary to listen to the prosecution, suggesting the evidence the man spot cleaned the knees of dirty bants to wash away just the blood. easier for him to listen to the prosecution pick apart janos'