Francisco Mack was 27 when he was last seen on December 4, 1988, in Chula Vista, California. Mack was not reported missing immediately, and there has been limited information released about any investigation or leads.

His whereabouts remain unknown and the disappearance is unsolved. Anyone who knew Francisco, saw him in Chula Vista around December 4, 1988, or has information about his movements is asked to contact investigators. What do readers in the Chula Vista area remember about that time?