A teenager is getting ready for a school dance. She’s quiet and shy but tonight, her friends are making her look and feel like a million bucks. It’s the summer of 1963, and they will all be dancing to the early strains of rock n roll. But for Margaret Willams, it would be the last dance she would ever attend. The next day her body would be found half naked on a nearby baseball field. Her killer is swiftly captured—but that is just the beginning of this story. In episode 99, Jac, Alexis and Billy look into a serial killer whose crimes spanned across decades and continents—and who was finally captured during the search for The Golden State Killer.