Cristina Tomas Martin, 19, disappeared during an attempted border crossing on June 25, 2007. She was last seen in Altar, Arizona, in Pima County wearing black jeans and white tennis shoes. Cristina is described as 4 feet 10 inches to 5 feet 0 inches tall, 100 to 130 pounds, with black hair and black eyes.

Family members were later told by an individual that Cristina had been left in the desert about three hours from Phoenix. Her disappearance was reported on July 17, 2007, and the case was entered into the National Missing and Unidentified Persons System on July 30, 2012. There has been no confirmed contact or further evidence about her whereabouts.

Anyone who knew Cristina, saw her near Altar on June 25, 2007, or has information about that crossing is asked to come forward.