One of two Navy SEALs involved in a parachuting accident near Marana on Thursday has died.

The other is in stable condition at a hospital, a representative from Naval Special Warfare Command said.

The SEALs, from an East Coast unit, were at a military parachute testing and training facility at Pinal Airpark northwest of Tucson when the accident occurred at about 12:30 p.m. The Department of Defense said they collided in mid-air.

The SEALs were "participating in routine military free-fall training," a spokesman for the command said.

The Department of Defense said a senior chief was taken to University of Arizona Medical Center, where he was pronounced dead.

The other SEAL is a petty officer first class, military officials said Friday.

Names of the SEALs have not yet been released.