how they picked the unsuspecting ron baker as their victim, wanted him to the tunnel, and supposedly and all hell broke loose. >> nathan jumped him, landed back onto the -- open no what to do. >> what was it like to hear him spit out that story. >> i had interviewed and taking confessions for many people over the years, confessed to serious crimes, robberies, homicides, sexual assault, but hearing him say that, for some reason i knew it was not -- bs. he was really telling the truth. and it caused me to step back, and say, did i really just hear that? >> was he emotional when he was telling you this. >> not at all. kind of, cold and calculating. he did not seem remorseful at all. >> even as he recounted ron's last desperate effort to survive. and his own instruction to nathan. >> i told nathan, you've got to finish him off or something, something like that because -- >> when he told nothing to cut his throat. >> for sure. and thinking about, it getting shivers. >> even now? >> yes, after 27 years. >> soon after, at the la police station, rick jackson received that precious audiotape.