And on the ground, a few feet away, half-buried in the shifting sand, was a pink blouse. It was stained with old, brown blood. Next to it, a pair of small bones—the remains of an unborn child, the forensic team would later say.

The tourists called the authorities. Pima County Sheriff’s deputies arrived, and within hours, the entire area was cordoned off. They carefully cut the cables and brought the skeleton down. They found scraps of a man’s shirt, a belt buckle, and, miraculously, a leather wallet still tucked into what was left of the trousers. Inside the wallet, protected by the leather against the elements for 13 years, was a driver’s license.