Along with the body, park personnel found a motorcycle on Wednesday below the South Kaibab Trailhead.
Officials believe the man to be 40-year-old John Pennington, who was reported missing last week.
Pennington was last seen on the South Rim of the Grand Canyon, possibly riding a yellow motorcycle, NPS has said.
The National Park Service and the Coconino County Medical Examiner are investigating the death.
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