the development brought aaron to a tipping point. were you no longer wavering at this point, aaron? had you come down on the side of, oh my god, my father killed my mother? >> yeah. yeah. >> now aaron, too, wrote his dad a letter. if he was guilty -- >> it's time. it's time to man up and do what you should have done two years ago. >> keith's defense attorneys went to the prosecutor to hammer out a plea deal. they agreed on 30 years in prison for the murder and for soliciting the hit. moments later, keith was standing in a paducah courtroom speaking the words his family and friends never in a million years thought they'd hear him say. yes, he murdered julie. >> there's no excuse for what i did. and i can't take it back. and she was my best friend. and i don't know what happened to me. but i did it. there's nothing i can do about it. >> temple bradley who works near the courthouse was there. >> my heart was breaking. that the person that i have --