>> kibby admits to killing seven women, but police say it's more. kibby is willing to talk to a forensic psychiatrist if he can avoid the death penalty. despite a wealth of evidence against him, authorities are willing to offer kibby a plea deal. at 70 years of age, it's unlikely kibby will be executed before he dies of natural causes, and the plea deal ensures he will cooperate with authorities as they attempt to connect him to unsolved homicide. >> there kibby before we start i want to mejs a couple of things to you so it's all out on the table for you. one thing is i think you know i'm a forensic psychologist. >> in 2009 he pled guilty to six additional murders. part of the deal agreement with kibby is he would speak with us and also agree to speak with park deets about the crimes he committed. >> i never have been involved in a case where we filmed a thing such as this and i know you haven't either so we're exploring new territory here. but part of what i want to make sure you understand there's no confidentiality, which is not the way it would