LAS VEGAS (KLAS) — Rescuers found three hikers alive, but a fourth hiker died after separating from the group south of Lake Havasu City, according to the Mohave County Sheriff’s Office.

According to his companions, 31-year-old Kyle Matthew Movius of Irvine, California, was already showing signs of dehydration and fatigue when the hikers called 911 on Friday, and he was found off the trail in the desert at about 10:20 a.m. on Saturday after a search that continued through Friday night. He had left the group in search of the trailhead at Sara Park, which has an extensive trail system south of Lake Havasu City.

Lake Havasu City Fire Department crews found the three hikers Friday. A 63-year-old woman and a 27-year-old woman were transported for immediate medical care, and a 61-year-old man was taken back to the command post. When fire crews found the three hikers, they were out of water and severely dehydrated.

Rescue officials said the hikers were visiting Sara Park from out of town and they were unfamiliar with the increased danger of hiking in the heat.

Mohave County Sheriff’s Office Search and Rescue teams had help from Western Air Rescue (Kingman DPS Ranger) and Central Air Rescue (Phoenix DPS Ranger) helicopters during the search.