Veteran firefighter Daniel Medrano got out of his truck somewhere in the barren outskirts of Sunland Park, New Mexico, where a vast expanse of yellow sand is dotted by stubby bushes. Medrano wrapped a black scarf around his nose and mouth as he looked closer: Black sneakers, green hat, dark hair in a braid. The Aug. 17 afternoon was around 100 degrees Fahrenheit (38°C), and Medrano believed the woman had died days before – another migrant killed by scorching heat while entering the United States