Victim identified as 55-year-old Mathiew Stanley of Ellington, Missouri.
The three victims were last seen alive Saturday afternoon, hiking along the Ozark Trail. By the next day, they were dead.
Reynolds County Sheriff Tom Volner says 36-year-old David Decareaux of Millstadt, Ill., and his 8- and 10-year-old sons were found Sunday.
The elk are scheduled to arrive at the refuge area of Peck Ranch on May 18 from a capture site in eastern Kentucky.