From a Wall Street Journal story by Alicia A. Caldwell headlined “Arizonans Seek Heat Assistance”:

Debra and Paul McKnight lived in the desert Southwest for about a dozen years and were used to temperatures in the 100s. When their truck broke down on a drive in Arizona last month, it was 118 degrees.

With no water on hand, the couple got out to look for help. Paul soon noticed that Debra, 46 years old, could barely walk. He eventually got water from a creek half a mile away, but by the time he returned, she was severely dehydrated. They eventually got help from a passerby three hours after they broke down, but Debra died soon after of heat stroke.