Editor’s note: This story contains explicit language.
EL PASO — On Sept. 14, after a day of picking melons in a small ranching town in Durango, Mexico, with his father, Jesús Iván Sepúlveda Martínez packed a small duffel bag with some clothes and a blanket. Sepúlveda Martínez approached his common-law wife and their 6-month-old daughter and told them goodbye.