Over the course of seven months in mid-1960s Katowice, Arnold killed four women and concealed their remains within his own apartment — a confined geography that ultimately led to his arrest when neighbors noticed the smell. His case is notable less for its scale than for its context: a pattern of escalating violence against women that had begun long before the murders, a confession offered without remorse, and a capture that turned on a routine street stop rather than any investigative breakthrough.