Colorado Coroner Reports Hypothermia as Contributing Factor in Hiker's Death in Abandoned Mine
In September 2026, the Ouray County coroner, Glenn Boyd, released autopsy results confirming that Jennifer Nelson, 54, drowned in an unmarked mine shaft in October 2025. Hypothermia was identified as a contributing factor to her death, with the shaft's water temperature recorded at 30 degrees. Nelson also sustained minor blunt force injuries. Her cell phone data indicated two unsent text messages to her husband, Jeff Rivera, attempting to call for help. The incident occurred after Nelson, an experienced hiker, went missing during a walk with her dogs. Rescuers located her body in the mine shaft after finding her dogs nearby. The mine was previously unknown to the Colorado Division of Reclamation, Mining, and Safety, highlighting the challenge of identifying and securing thousands of abandoned mines across the state. The shaft has since been covered with a metal grate and permanently closed by the state.