9-year-old Nelida was last seen walking to Blackstone Elementary School on Shamut Avenue in Boston, Massachusetts on December 20, 1976. Nelida was enrolled in a 3rd grade billingual class and the school was approximately 1 in a half blocks away from Nelida's home. Nelida never showed up for school and hasn't been seen since. Nelida speaks Spanish and limited English. She had a shy, quiet nature at the time of her disappearance and was distrustful of strangers.
Two weeks after Nelida disappeared, some of the clothes she wore was found in the possession of Anthony "Rudy" Flores. A woman called the police to report Rudy had given her a hat and some gloves, and was suspicious because Rudy resembled the sketch of Nelida's possible abductor. The hat and gloves belonged to Nelida. Rudy claims he found them lying on the street and when police caught him, he had a fake badge and gun in his possession. Nelida's family believes that Rudy abducted her while posing as a police officer whom Nelida would've trusted.
Rudy was never charged in connection with Nelida's disappearance due to lack of evidence. Rudy remains his innocence in Nelida's case, but is still considered a suspect. He is suspected in the disappearance of 14-year-old New York girl, Cesilia Pena, but he hasn't been charged in her case either. Rudy is currently serving a life sentence for abducting, raping, and murdering a woman and her daughter in New York.
Eight years later in January 1985, Nelida's mother, Theodosia De Jesus claimed she saw a picture of her daughter in the apartment of David R. Collins (who has a reported criminal record), but later changed her mind. Collins doesn't appear to be considered a suspect in Nelida's case. Nelida is a Hispanic female with brown hair & eyes. She has pierced ears and was last seen wearing a gold-colored coat, hat & gloves, white pullover sweater, dark blue slacks, and black platform boots.