Joiner was last seen in Thonotosassa, Florida on September 22, 1972. It has been reported that she came home from school, ate a sandwich, then left home to walk her pet raccoon, Bandit, on a leash. Witnesses saw Joiner standing near a white car parked on the edge of a work area, but nobody saw her get in the vehicle. She has never been heard from again. Joiner moved to Florida from Michigan a few months before her disappearance. She has six siblings.