Today: June 18, 2006 at 9:1:6 PDT Yellowstone Tourist Dies in 500-Foot Fall ASSOCIATED PRESS YELLOWSTONE NATIONAL PARK, Wyo. (AP) - A woman lost her footing after stepping over a retaining wall to take a photograph and went over a cliff, falling 500 feet to her death in a canyon, park officials said. The 52-year-old woman was visiting the park with her husband and two children. Her husband flagged down a passing motorist, who called 911 after the Saturday morning accident at an overlook along the Yellowstone River, park officials said. A ranger rappelled down the canyon wall to reach...