but, listen to what gregory says. >> what happened that day? what happened when you went in the second time? why do you go back? and >> i took the kids out of the car, and forgot to put the president. >> what happened when you got back in the house? because that's >> i picked up the presence and left. >> you heard it, gregory changed his story. just enough to put himself in the murder scene, alone with kit. with that, a quarter century after the murder of his estranged wife, gregory monique was arrested and charged, with first of the murder. boyd called kid's brother, joe. >> i think he said, we've arrested him, and i didn't know it for, honestly. remember, i have given up. why did you arrest him? >> why, indeed. dna from an uncertain time, a few ambiguous comments in a private diary, and a cops trick, that produced a slightly edited