Mr. Haverstick had a history of heart problems and had bypass surgery, according to the coroner.
Park spokesman Terry Baldino said a California Highway Patrol helicopter spotted the body of Jay Haverstick, 69, on Wednesday, a day after a travel companion reported him missing.
The park spokesman said it appears Haverstick may have gotten lost on a day when the temperature reached 112 degrees in Death Valley.
Haverstick was an avid outdoor photographer and had ventured out to take pictures of a sand dune area.