Annette and her sister, Mylette, disappeared from Jacksonville, Florida on August 1, 1974. Their mother left them alone at home at approximately 6:00 p.m., while she went to care for a sick relative. The girls' father was supposed to arrive home from work at 6:00 p.m., but he got delayed by an hour. When he did get home, Annette and Mylette were nowhere to be found and the family dog, which usually had the run of the house, was shut up in a bedroom. The girls were never heard from again.

That year several young girls between six and twelve disappeared from the Jacksonville area. The first was Jean Marie Schoen. Virginia Suzanne Helm vanished on September 27, and Rebecca Ann Greene disappeared on October 12. Helm's body was found a month after her disappearance and Greene's body was found three years later. Schoen's body and the Anderson sisters' remains were never found. Because the abductions happened in different parts of the city, authorities don't believe they are related. Investigators theorize Annette and Mylette were killed by Paul John Knowles, a serial murderer who was killed by police later in 1974. A photo of him is posted below this case summary. After his death, they found tape recordings where Knowles said he'd abducted two girls matching the description of the Anderson sisters, killed them and buried them in a remote area at the west end of Commonwealth Avenue.

Annette and Mylette were both students at Louis Sheffield Elementary in 1974. Their cases remain unsolved.

Above: Paul John Knowles