A 57-year-old female hiker passed away early Monday morning as she was attempting an eight-mile hike in the Grand Canyon and became unconscious in the remote Tuweep area of the park. A ranger arrived on scene at around 1 a.m. and pronounced her dead. On Sunday, the high temperature in the area was well over 100 degrees, with the high temperature at Phantom Ranch at the bottom of the canyon reaching 114 degrees. Park rangers at Grand Canyon National Park urge visitors to Grand Canyon, especially inner canyon hikers and backpackers, to be prepared for excessively hot days in the coming weeks. An Excessive Heat Warning has been issued for inner canyon portions of the Grand Canyon through Wednesday. An investigation into the death is being conducted by the National Park Service, in coordination with the Mohave County Medical Examiner.