>> to whidbey island. >> to the police. >> yes.elt 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? when "dateline" continues. everything that touches your baby should be this comforting pampers swaddlers, the #1 choice of hospitals, is 2x softer and wraps your baby in our most premium protection so every touch is as comforting as the first pampers the #1 choice of hospitals, nurses & parents itso chantix can help you quit "slow turkey." along with support, chantix is proven to help you quit. with chantix you can keep smoking at first and ease into quitting. chantix reduces the urge so

>> uh, because you're from -- whidbey island? >> would it surprise you that i've been talking to him almost daily for the last week and a half? >> yeah, it would surprise me. >> i just wanted to see a reaction. up until that point he was playing it pretty cool, and i think i got the reaction i was hoping for. it kind of deflated him a little bit. >> it's truth or dare time, jim. you know what you told bill. he's your best friend in the whole world.

>> uh, because you're from -- whidbey island?u that i've been talking to him almost daily for the last week and a half? >> yeah, it would surprise me. >> i just wanted to see a reaction. up until that point he was playing it pretty cool, and i think i got the reaction i was hoping for. it kind of deflated him a little bit. >> it's truth or dare time, jim. you know what you told bill. he's your best friend in the whole world. the guy is falling apart over this, literally falling apart over the guilt he's carrying around because you told him what you did. >> i don't buy that for a minute. >> if revealing bill hill as their source was intended to shock jim huden into confessing it failed. with no murder weapon, no warrant and no authority to make an arrest in the state of florida, the detectives had to let their primary suspect go free. were you worried at all about bill hill? now you've disclosed he's the source of all this. >> we made sure before we went back to washington that bill understood that we had to give his name, but my