Ruben was last seen on April 7, 1983 in El Paso, Texas. He left home to walk to Eastwood Knolls Elementary School and apparently never arrived for the day's classes. His mother reported him missing when he didn't come home from school. A friend of his thought he saw him running towards McRae Street at about 5:30 p.m. Foul play is suspected in Ruben's disappearance, which remains unsolved. Ruben's nickname is Ru. He has a freckled complexion and his hair has a reddish tint. Some agencies give his middle name as Robert or Roberto.