Luis Ernesto Carbajal Alvarado, 31, disappeared after making a final call to family from an airport in Guanajuato, Mexico on August 24, 2009. He said he intended to cross into the United States through Sonora and his last known U.S. location was Lukeville, Arizona. He had crossed the border many times before, which made the sudden and complete break in communication especially alarming.

Luis is described as a Hispanic male, 5 feet 2 inches to 5 feet 4 inches tall, 165–175 pounds, with black hair, brown eyes, a sparse beard and mustache, and distinguishing tattoos including East Side on his stomach, Traviesos on his back, Carbajal on an arm, and either three dots or the letter L on his right hand. He also has a large round mole on his left knee. At the time he was believed to be wearing a long-sleeved blue t-shirt, black denim pants, dark grey boxer shorts, white socks, green hiking boots, and carrying a black backpack plus a black leather belt; he had both a black and a gray sweater with him.

The Pima County Office of the Medical Examiner is listed as the investigating agency. Nothing further is known about his whereabouts after that call. If anyone saw Luis around Lukeville or along the Arizona–Sonora corridor in late August 2009, or has information about his route or companions, please share what is known.