Montrose, CO—On the afternoon of Monday, July 10, 2017, a 49-year-old female, Tracey Lister of Lakewood, Colorado, collapsed while hiking on the Gunnison River trail of the Black Canyon of the Gunnison National Park. Park Rangers were summoned and determined the hiker was dead. Her body was recovered by the Park Rangers and the Montrose County Coroner took legal custody of her body. The death is under investigation by the Montrose County Sheriff's Office, Rangers of the Black Canyon of the Gunnison National Park, and the Montrose County Coroner's Office of Medical Investigation. The cause and manner of death are not yet determined and are pending investigation. An autopsy has been orderedby the Montrose County Coroner.