McCollins Umeh, a football recruit at the University of Arizona, died Tuesday after collapsing during a voluntary offseason workout. He was 18.

Umeh, a 6-foot-3, 245-pound defensive end, was rated by recruiting experts as the top player in Arizona's incoming freshman class. He arrived at the school's Tucson campus Monday with other recruits and transfers for workouts in preparation for the start of training camp in August, Athletic Director Jim Livengood said.

Umeh passed a physical examination Tuesday, but later collapsed 20 minutes into a 30-minute workout, the school said. He was taken to University Medical Center, where efforts to revive him were unsuccessful.

"All our thoughts and prayers are with McCollins's parents," Livengood said in a statement. "There is no easy way to describe how devastating this tragedy is to the family and to the entire university community."

University officials said they have no information about the cause of Umeh's death. The temperature in Tucson at the time of Umeh's collapse was 96 degrees, according to the National Weather Service.

Although the NCAA doesn't allow official football practices until August, voluntary workouts with strength coaches and training staff are permitted. Head coaches and assistants aren't allowed to attend voluntary workouts.

-- Bloomberg News