not just that jim huden gave it to him, but he taught jim huden to fire the weapon and that jim hudenave it back to him just a few days after the murder of russel douglas. >> if you'd had that information before you went to florida, you could have brought jim huden back in cuffs. >> you bet. >> instead, now you've got the proof, and jim huden is nowhere to be found. >> right. we have all we need. now we just need jim. >>> coming up, with jim out of the picture, his lover peggy thomas meets a new man, a millionaire cowboy who was about to be taken in a wild ride. >> she said, but i didn't have nothing to do with it. i said, well, did you take a lie detector. she said no, my lawyer told me not to. i'm like, if you're innocent, why wouldn't you take a lie detector? and she never gave me a good answer. i looked in her eyes, she's evil. >> when "dateline" continues. a type of irregular heartbeat not caused by a heart valve problem. but no matter where i ride, i go for my best. so if there's something better than warfarin, i'll go for that too. eliquis. eliquis reduced the risk of stroke be

huden. josh mankiewicz: jim huden, in the age of google, that was all the break mark plumberg needed. by the end of the day, the detectives knew that jim huden lived in south florida and played in a band. and according to the band's web site, one of its members was retired air force. and so the next time the caller phoned, detective beech was ready. he was asking me, were you able to do anything with what i gave you? and i said, well, yeah. but i think i'm looking at a picture of you. and the phone went quiet. and he goes, you guys are good. i go, we're not good. it was just simple google searching. josh mankiewicz: at last, the detectives had a solid lead-- one that raised plenty of questions. who was this jim huden? and why was their tipster so willing to give him up? the cops knew the answers to those questions could not be found in a google search. they would have to fly to southwest florida, at a time of year when violent storm clouds always seemed to lurk just over the horizon. coming