Over the weekend, the Texas heat proved deadly to a man and his teenage stepson hiking the Marufo Vega Trail in Big Bend National Park. The Communications Center of Big Bend National Park received an emergency call from the trail on Friday, June 23 at around 6 p.m. after a 14-year-old became ill and fainted, according to a statement from park officials. The group was hiking in extreme heat, facing temperatures as high as 119 degrees.