The pickup belonging to an 80-year-old Morton man who was reported missing on Monday was found Friday, hundreds of feet down an embankment off a Forest Service Road south of Randle.
Family members say William "Bill" Osborne likely died on impact.
Osbourne disappeared Monday, hours after planning a hunting trip for the next day with his son.
The son, who traveled to Morton from his home in Portland, found Osborne's house empty and his vehicle missing.
Dozens of people helped search for Osbourne.