>> reporter: even after a three hour grilling -- >> i will burn you. i am telling you. >> reporter: michael never cracked. edmunds had to face the fact that michael was in all likelihood telling the truth. by then, they'd come to believe his albi was solid. and they'd figured out that the glass from the crime scene that had so suspiciously turned up on michael shoes, could be easily explained. michael had gone to look at the smashed in back door with the contractor just before police arrived. >> did you have anything to do with that day? >> if i did, i wouldn't be sitting here. >> did your mother ever ask you to kill kay? >> absolutely not. absolutely not. >> only thing she's ever done is just like anybody else, you know? riding in the road, somebody cut 'em off. "oh, i wish you'd drive off the face of that cliff." that's the only thing i'd ever heard sayin' about harmin' anybody. >> did you think that your mother could possibly have done the thing that they were accusing her of. >> no. and i don't think she could do it. >> reporter: jimmy edmunds wasn't so sure.