Luis Fernando Soto Ramirez, 26 and known as Prona, was last seen April 11, 2010, in the border area around Lukeville in Pima County, Arizona. Reports say he was crossing from Mexico into the United States; some accounts place him in the San Luis area of Yuma County, so his last precise location is uncertain.

He is described as a Hispanic male, 5 feet 6 inches tall, 150–170 pounds, with black hair showing a hint of gray, dark brown eyes, a pierced ear and a healed cut on his eyebrow. At disappearance he wore navy blue denim pants, a green belt with a metal buckle, and either blue and white Nike tennis shoes or black shoes, plus a green camouflage military-style cap. He was carrying a black wallet with about 4,000 pesos. The Pima County Medical Examiner’s Office is listed on the case, and it was entered into NamUs on July 30, 2012.

Many details about his movements that day remain unknown. Anyone who knew Luis, saw him around April 11, 2010, or has information about border crossings in the Lukeville or San Luis areas is asked to come forward.