CNN:

"Randy Udall, 61, went on a hike in the Wind River Range in Wyoming on June 20 and was expected back six days later.

When the experienced hiker did not return, family members reported him missing. Rescue crews and helicopters scoured mountain passes to find him.

A helicopter search team discovered his body in a remote area on Wednesday afternoon, the Sublette County Sheriff's Office said."

Udall, brother of Senators Mark Udall of Colorado and Tom Udall of New Mexico, also is a son of the late Morris “Mo” Udall of Arizona, reportedly had planned on backpacking alone for nearly a week, starting on June 20. He is known to be an experienced mountaineer, and to have hiked in the Wind River Range numerous times.

Udall, a locally well-known advocate for alternative energy and the need to protect the environment from over-development, co-founded and was the original director of a valleywide energy efficiency organization, called the Community Office for Resource Efficiency or CORE.

Udall also has been an outspoken critic of the oil and gas recovery method known as hydraulic fracturing, or “fracking,” which is in widespread use around the U.S. and in Western Colorado, particularly in Garfield County,