After murdering five people, the killer known as BTK made his first contact with the media. But now he’s disappeared. For three long years would waits, before forcing his way into the home of a woman and slaying her while her children listened. Nine months later he would kill again, and continue to taunt the police, writing “Do the cops think that all those deaths are not related? Golly-gee yes the MO is different in each but look--a pattern is developing.” The pattern was laid out for all to see. But even when he resurfaces six years later to kill once more, the cops are clueless. In episode 102, Jac. Alexis and Billy are again joined by Denis Rader’s daughter Kerri, and they attempt to answer the question: how do the circumstances in a killer’s “normal” life change the way he chooses victims in his sadistic life.