It wasn’t your typical jump-scare, no image of a hungry Great White Shark attacking a beachgoer. Instead, it was a scene in which a crowd boards a ferry on the Fourth of July, a seemingly innocuous moment in Steven Spielberg’s iconic masterpiece. In the shot, a female extra wearing a blue bandana over her auburn hair caught Hill’s attention. She was “almost a twin of the figure” in a forensic recreation image he recently saw of the Lady of the Dunes, the still-unidentified murder victim discovered in Provincetown in 1974—the very same year Jaws was filmed on nearby Martha’s Vineyard.