it's in his pocket and he's on fire. yeah. that stays with you. >> reporter: and now these taunting letters from roberto's killer almost taking prideful delight in how he killed the man and almost murdered the boy. who could it be? who would do such a thing? and why? then four days after the diagram showed up, one of the alpha males of the moore clan walked in the front door. roger moore. paul's dad. and like his son, wanted to help catch the killer. and told the detectives he had important evidence to share. it was an audiotape, answering machine messages his nephew pete left on his phone. >> coming up -- investigators discover a brand new suspect. >> we may have somebody else to look at. >> but who are the hunters and who are the hunted? >> and all of a sudden the tire