A woman was found dead Sunday on the Tonto Trail in the South Rim of the Grand Canyon. National Park Service officials say they received a report of a backpacker experiencing heat illness on the Tonto Trail near Monument Creek at about 1:15 p.m. The backpacker, 53-year-old Michelle Meder of Hudson, Ohio was on a multi-day backpacking trip from Hermit to Bright Angel Trail. On Saturday, while hiking the Hermit Trail, she became disoriented and then unconscious. When rangers found her, she was pronounced dead. The cause of death is believed to be heat-related. The temperature that day at Phantom Ranch was 115. Park Rangers at the Grand Canyon National Park are strongly urging visitors, especially inner canyon hikers and backpackers, to be prepared for excessively hot days in the coming weeks. In the summer, temperatures on exposed parts of the trail can reach over 120 degrees in the shade. Park rangers strongly advise not hiking in the inner canyon between the hours of 10 a.m. and 4 p.m. For more information on smart hiking in the canyon, log onto nps.gov.