In the third and final part of this series, we explore what happened to the mountain of evidence in the 1984 cold case murder of Kelly Jean Robinson -- and we discuss what could come next in law enforcement's investiation into Kelly's death.

Kelly's body was found floating in a rural Minnesota gravel pit pond, roughly 30 miles from her home in Sioux Falls. Her case remains unsolved.

If anyone has any information on the murder of Kelly Jean Robinson, please contact the Minnesota Bureau of Criminal Apprehension at 1-877-996-6222.

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

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The Vault is written, edited and produced by Forum News Service investigative reporter Trisha Taurinskas.

For more information on the murder case of Kelly Jean Robinson, visit https://www.inforum.com/people/kelly-robinson.

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.

Forty years after a 22 year old woman was found floating in gravel pit pond in rural Minnesota, a man who was adopted an infant took two at-home DNA tests. The results led him to the discovery that his biological mom was Kelly Jean Robinson, the woman found dead in the pond. She had been murdered, and her case had gone cold.

In coordination with Kelly's family, the team at The Vault obtained the investigative file, which included never-before-released information. New suspects emerged. Details about her autopsy were exposed. And, for the first time, Kelly's family learned a very critical fact in this case: a semen sample, obtained through the autopsy, was taken into evidence.

To see images of Kelly, visit: https://www.inforum.com/people/kelly-robinson

The Vault is written and hosted by Forum News Service reporter Trisha Taurinskas.