On Sunday, March 15, 1964, shy and cautious Mary Theresa Simpson waved goodbye to her two cousins and her aunt as she turned to go home to her dad's house, and they walked into a neighborhood store. Mary Theresa never made it home, and her body was found on Combs Hill Road just 4 days later. The Elmira City Police Department is still investigating this case, and unfortunately, it isn't the only one of its kind. In What Happened to Me? factual accounts and narrative storytelling meet to explore the evidence and wider context of the disappearance and murder of 12-year-old Mary Theresa Simpson. A cold case that still weighs heavy on the heart of Elmira, New York.