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Who Killed My Daughter? (Dell Publishing) is a 1992 non-fiction book by Lois Duncan. It is mainly about Duncan's search for her daughter's murderer. 18-year-old Kaitlyn Arquette (Duncan's daughter) was shot to death on July 16, 1989 while coming home from a friend's house. Duncan conducted her own investigations, which included talking to her daughter's friends, and visiting a psychic. While the police believed the shooting to be random, Duncan believes the killing was by the Vietnamese gang running an insurance fraud and drug operation in which Arquette's boyfriend was involved.