A 71-year-old visitor from Japan died Thursday after he suffered an apparent heart attack at Thurston Lava Tube in Hawaii Volcanoes National Park.

Acting Chief Ranger John Broward said that the man was hiking out of the lava tube with a tour group, at approximately 1 p.m. After walking up the steepest section of the trail, Broward said that the visitor felt fatigued, was short of breath, and sat down to rest.  He added that the man quickly collapsed, lost consciousness, and stopped breathing.

Several visiting nurses and a tour operator performed CPR until park rangers arrived with an automated external defibrillator, or AED. The man’s care was turned over to the County of Hawaii Medic 19, but he was eventually pronounced dead by a doctor from Hilo Medical Center.The name of the victim is being withheld pending further notification of his family.