A hiker collapsed and died on a trail in Grand Canyon National Park in Arizona over the weekend, prompting parks officials to warn about the dangers of hiking in extreme heat.

Scott Sims, 69, of Austin, Texas, was attempting to reach Phantom Ranch via the South Kaibab Trail for an overnight stay when he was found semi-conscious around 7 p.m. Saturday, the National Parks Service (NPS) said in a statement on Monday.

Sims became unresponsive a short time later, and bystanders performed CPR until three NPS paramedics arrived, parks officials said. All attempts to resuscitate Sims were unsuccessful.

Sims collapsed on the River Trail, about halfway between the Silver Bridge and Black Bridge near Phantom Ranch, according to the NPS. Temperatures on exposed parts of the trail can reach 120 degrees in the shade, the agency said.

HIKER LOST FOR 10 DAYS FOUND ALIVE IN NORTHERN CALIFORNIA MOUNTAINS

Scott Sims was found semi-conscious on the River Trail at Grand Canyon National Park on Saturday. He became unresponsive a short time later. (National Park Service, File)

“Park rangers strongly advise not hiking in the inner canyon during the heat of the day between the hours of 10 a.m. and 4 p.m.,” NPS said. 

Temperatures on the trail can reach 120 degrees in the shade, NPS said. (Patrick Gorski/NurPhoto via Getty Images, File)

Officials said that its efforts to help hikers during the summer months may be delayed due to limited staff, an increased number of rescue calls, safety requirements for staff and helicopter usage being limited in extreme heat or periods of inclement weather.

COUPLE MISSING IN UTAH MAY HAVE BEEN SWEPT AWAY IN FLASH FLOOD WHILE EXPLORING TRAIL ON UTV

NPS and the Coconino Medical Examiner are investigating the death. No cause of death was immediately provided. 

No cause of death was immediately provided. (Patrick Gorski/NurPhoto via Getty Images, File)

The death comes after a Salt Lake City fire captain died in a rafting accident at Dinosaur National Monument in Colorado.

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An NPS review of deaths in national parks between 2014 and 2019 found that hiking was the second-deadliest recreational activity behind driving, while drowning caused the second-highest number of unintentional deaths after motor vehicle crashes.