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.