EPISODE 25 Two Girls Named Mary: The Mall Murders Hiding in Plain Sight Mary Opitz She left a bag of pretzels on the roof of her mother's car. That was the last trace of her. It was January 1981, at the Edison Mall in Fort Myers, Florida. Seventeen-year-old Mary Opitz had spent the afternoon shopping with her mother, Nancy, and her older brother Chris, hunting for a birthday present for a family friend. Mary got tired. Mary took the shopping from her mother, said she'd wait a