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A view of a hot spring at the Norris Geyser Basin at Yellowstone National Park on May 12, 2016.
Yellowstone, the first National Park in the US and widely held to be the first national park in the world, is known for its wildlife and its many geothermal features.  / AFP / MLADEN ANTONOV        (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)
A view of a hot spring at the Norris Geyser Basin at Yellowstone National Park on May 12, 2016.
Yellowstone, the first National Park in the US and widely held to be the first national park in the world, is known for its wildlife and its many geothermal features.  / AFP / MLADEN ANTONOV        (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)

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    Man falls into Yellowstone hot spring

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Man falls into Yellowstone hot spring

A man visiting Yellowstone National Park was killed after he stepped off a designated boardwalk, slipped and fell into a hot spring.

Man falls into Yellowstone hot spring

A man visiting Yellowstone National Park was killed after he stepped off a designated boardwalk, slipped and fell into a hot spring.