Officials are reporting three heat-related deaths inside the Grand Canyon, all occurring final week. Emergency crews discovered a 72-year-old man lifeless Friday alongside the South Kaibab Trail. In a separate case Tuesday, first responders discovered a 67-year-old man and 68-year-old lady alongside the North Kaibab Trail. Officials say temperatures inside the canyon can exceed 109 levels, even in the shade. The deaths are a stark warning concerning the hazard of mountain climbing in excessive warmth.