-- i felt guilty i was giving up my friend, but i knew something had to be done. >> within days of that call detectives mark plumberg and mike beach were sitting face-to-face with both their tipster bill hill and their suspect, the artist formerly known as buck naked. coming up, the interrogation gets tough. >> you know what you told bill. the guy is falling apart over the guilt he's carrying around because you told him what you did. >> will jim crack or will detectives realize they've got the wrong man?