In part 2 of this series, the team at The Vault tries to track down a man previously considered a potential suspect in the 1984 murder of Kelly Jean Robinson. In the process, they run across a new potential person of interest: a convicted murderer who preyed on South Dakota workers in the 1980s. He was a free man in 1984 -- and he was known to frequent The Frontier Bar, where Kelly Robinson was last seen leaving.

For images from court documents and photos of kelly, visit: https://www.inforum.com/people/kelly-robinson

This episode is written and produced by Trisha Taurinskas.

A special thank you to Jean Monthei for her on-the-ground assistance in this series.