Duncan was last seen in Los Angeles, California on November 4, 1984. She disappeared under suspicious circumstances and has never been heard from again. Just before her disappearance, Duncan called her mother twice. She said she was frightened of a man she knew and asked her mother to pick her up. Few details are available in Duncan's case. Her father and many of her other family members have died since her disappearance, but her mother is still alive and still looking for her.