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251 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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In the quiet community of Longmont, Colorado, a family is grappling with the uncertainty of a missing loved one. Seventeen-year-old Diana Nielsen was last seen on September 17, 2024, and her disappearance has left a void in the lives of those who know her. The circumstances surrounding her last known moments remain undisclosed by authorities, adding a layer of mystery to the distressing situation. Her case is registered with the National Center for Missing & Exploited Children, a stark reminder ...Read More
Last Seen: Sep 17, 2024

Victim Details

Jan 28, 2026

Jan 28, 2026

Diana

Nielsen

17

17

White / Caucasian

Female

Sep 17, 2024

Longmont

Colorado

05/30/2026