(In Touch Weekly) — Imagine coming face-to-face with a killer hours before he took the life of your loved one, and not knowing it. That’s exactly what happened to a man named Steve Relford, the son of BTK serial killer victim Shirley Vian. He was just a child at the time, but over forty years later he’s retelling the chilling moment for the Investigation Discovery documentary special BTK: A Killer Among Us, which will air on February 17 at 10 pm.