On July 6, 1973, Linda Ann O’Keefe, 11, woke up for summer school at her home in Newport Beach, California. She put on the dress her mother had made for her. It was a pretty dress with light blue flowers and dark blue trim. She then put a ponytail in her hair, put on her white ankle socks and dark blue shoes, and headed out the door. Her piano teacher would be picking her up that day.