This file photo of Jackson Standefer was taken at Grand Canyon National Park.
Mark McOmie, Standefer's uncle, also said the family was waiting to comment until the body was formally identified.
After the pair initially went missing, the National Park Service launched an extensive multi-day search effort that included three ground teams, a helicopter and crew, an unmanned aerial system and operator, and an inflatable motor raft and associated search team.
Police in Tennessee say investigators believe bounty hunters shot two men in a wild incident last weekend that began in a Wal-Mart parking lot, fatally wounding one of them. They were on a trip with Standefer's mother and Merrell's husband.
The last signal emitted from the missing Standefer and LouAnn Merrell has been in the bottom of the canyon during a hike from the North Rim to an area known as Tapeats Creek.
Randy Merrell shows a custom orthotic at his lab in Dry Fork Canyon, northwest of Vernal, Utah, in 2012.
The Coconino County Medical Examiner's Office has immediately received the corpse via helicopter delivery and is in the process of examining the identity through DNA sample testing. A school spokesman said he was active in outdoors programs, crew team and a Christian youth group.
GRAND CANYON NATIONAL PARK, Ariz.
Experienced hikers say it's an arduous hike down the canyon that ends in stunning and unique views.
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