John Wayne Glover, known as "The Granny Killer," terrorized Sydney's North Shore from 1989 to 1990. He targeted elderly women, bludgeoning six victims with a hammer as they returned from shopping . He lived quietly with his wife, attended church, and sang in the choir. When police arrested him, he confessed casually, telling detectives: "I knew you'd get me eventually." He died in prison in 2005. The Granny Killer's case changed how Australia tracks violent offenders—because no one suspected a man who sang hymns.