John and David were childhood friends who became adult predators. They’d been raping their way along the rail network of Greater London for four years by the time they attacked Anne Locke.
After three rapes in one night, a massive manhunt had led to their being questioned in July 1985. They were again questioned in September that year. Duffy was arrested on 12 May 1986 for carrying a knife.
And for a third time he was released. Six days later Anne Locke became their third fatal victim...