This June 25, 2015, photo provided by the Yellowstone National Park Service, shows Black Pool at the West Thumb area of Yellowstone Lake in Mammoth Hot Springs, Wyo. A 23-year-old kayak guide, Timothy Hayden Ryan Conant of Salt Lake City, died while trying to rescue a client who capsized in the West Thumb Basin area of Yellowstone Lake Wednesday, June 14, 2017. (Diane Renkin/Yellowstone National Park Service via AP)
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