MOBILE USERS: A slideshow look at several of the children who have gone missing in southern Arizona is available HERE.



This week marks the 20th anniversary of Grajeda's disappearance outside her apartment complex at 175 West Valencia Road. Karen was last seen playing outside her home on Jan. 11, 1996.



She was 7 years old at the time, stood 3-foot-5 and weighed approximately 50 pounds.



Karen has dark brown hair and her right front tooth is larger than her other teeth, according to the most recent flier provided by the National Center for Missing and Exploited Children.



Karen also has pierced ears and was wearing a gold chain with a pendant on it when she was last seen.



Anyone with information about the case should contact the National Center for Missing and Exploited Children at 1-800-843-5678 (1-800-THE-LOST), Tucson Police Department at 520-791-4444 or 88-CRIME.