NATIONAL PARKS: Young hiker, 73-year-old fisherman die at Yellowstone Published: Friday, July 19, 2013 A 23-year-old solo hiker was found dead yesterday by the summit of an 11,000-foot mountain in Yellowstone National Park. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.