Santos Callejas Martinez, 38, was last seen June 13, 2012, near Falfurrias, Texas, after attempting to cross the U.S.-Mexico border. He told his family on June 8 that he planned to cross. Those traveling with him say he was left behind after becoming severely ill during the trek — fainting, struggling to breathe, and eventually unconscious with his eyes closed about three miles east of Freeway 2191 and two to three miles south of Freeway 285. He had removed most of his clothing because of the extreme heat.

Searches have not located Santos, and the exact circumstances of his disappearance remain unknown. The case underscores the dangers migrants face in extreme heat and remote terrain. If anyone has information about Santos Callejas Martinez or his movements that June, please come forward.