A 38-year-old Denver woman who had been hiking alone died Saturday on the Deer Mountain Trail in Rocky Mountain National Park, according to park officials.

The body of Christine James, who recently had moved to Colorado from Texas, was found around 2 p.m. She was unconscious, had no pulse and was not breathing. Her body was discovered just below the summit, about 3.5 miles from the trailhead.

For more than an hour, park visitors, who had found James, administered CPR, park officials said. By 3:15 p.m., park rangers arrived and administered advanced life-support measures, but she was ultimately pronounced dead at the scene.

The cause of death is under investigation, but foul play is not suspected, park officials said.

A dozen Rocky Mountain National Park Search and Rescue team members were involved. They reached the trailhead with James’s body at 7:35 p.m., and the body was transferred to the Larimer County Coroner’s Office.