In the late mid- to late 1970s. reporter: back in those day, las vegas was a gangster s paradise that inspired a cinematic staple. remember casino ? meeting in the middle of the desert always made me nervous. it s a scary place. reporter: dead bodies in trunks, shallow graves, cement boots. we re assuming mafia, everything because it s vegas. reporter: these two retired vegas cops, now podcast hosts are offering $5,000 to any diver who finds another body. i feel it would be interesting to close out some cases or identify some people that are mission persons. so the body in the barrel that was found was found right here when it was dumped decades ago, it would have been under a lot of water. this would have been somewhere near the middle of lake mead. so a safe, submerged secret not anymore. this is now the shoreline. and so detectives from vegas are now faced with a decades old murder, a vast crime scene, and right now very little to go on
reporter: because in that decomposing body, they found a gunshot wound. we believe the incident occurred in the late 1970s to early 80s and we re basing that upon footwear and clothing that the victim was found wearing. and we know that that footwear and clothing was sold at kmart in the late mid to late 1970s. reporter: back in those days, vegas was a gangsters paradise that inspired a cinematic staple. remember casino? meeting in the middle of the desert made me nervous. it is a scary place. reporter: dead bodies in tru trunks, shallow graves, cement boots. we re assuming mafia because it is vegas. reporter: these two retired vegas cops, now podcast hosts, are offering a reward to a diver who finds a body. it would be interesting to close out some cases or identify some people that are missing persons. reporter: so the body in the barrel that was found was found right here. when it was dumped decades ago,