Texas man dies during Grand Canyon hike as park officials make dire warning about silent killer

A Texas man hiking a popular trail in the Grand Canyon over the weekend has been declared dead, the National Park Service announced. Scott Sims, 69, is from Austin, Texas, and was hiking in the Grand Canyon when he died Pictured: South Kaibab Trail at Grand Canyon National Park. The Black Bridge marks the end of the South Kaibab Trail Grand Canyon National Park is seen from the South Kaibab Trail along the South Rim trailhead Extreme heat is known to cause heat exhaustion and heat stroke, with the latter having the potential to be fatal if treatment isn't administered immediately. A new analysis this year ranked the Grand Canyon as the most dangerous national park in the country, mainly due to extreme heat, risk of falls and the presence of wild animals.