one is john mark byers, haunted by his son christopher's death. if i'd met you in may of 1993, how convinced would you have been of the guilt of the three teenagers? >> 100%. >> reporter: so now, do you believe that the three men in prison are guilty? >> no, ma'am. they're 100% innocent. we needed someone to hate to survive because our child was dead. >> reporter: we meet damien echols at the super max prison, an hour's drive south of little rock. his hair is still coal black, but now his gaze is sharp. you were asked at the trial, did you kill christopher byers. your answer then was -- >> no. absolutely no. >> reporter: your answer is? >> no. absolutely not. even though it's been 20 years, you don't get used to being asked that. that's the kind of thing that screws with your head for the rest of your life. to have people, to constantly have to answer that question or constantly have people asking you that. it's like being kicked in the stomach over and over and over again. >> reporter: those sterile images of the little boys down by the creek, ho
