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Nik Wallenda looks at the area over the Little Colorado River in the Grand Canyon. Wallenda will tightrope walk over the canyon June 23. Photo/Jason Elias/Discovery Channel.

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Nik Wallenda to walk tightrope over Little Colorado River June 23

On June 23, Nik Wallenda, also known as the "King of the High Wire," will walk on a tight rope across the Grand Canyon's Little Colorado River, his highest walk ever.