Carlos Castellano Aguilera disappeared in the border town of Nogales, Arizona, on November 8, 2009. He was 20 years old at the time, Hispanic, between 5 feet 6 inches and 5 feet 8 inches tall, and weighed between 160 and 180 pounds. He had brown hair and brown eyes, a scar on his left eyebrow and another above his lip.

He was last seen crossing the border near Nogales wearing a plaid shirt described as either red or white, light blue Levi 501 pants, tan leather shoes and a military-style hat. The Pima County Office of the Medical Examiner is handling the case, with involvement from the Mexican Consulate. The file was entered in NamUs on July 30, 2012, as MP16311 (agency case FSC MPR 1536). Few details about his movements after that last sighting have been released.