" The same photograph of Bob, with a trim little moustache airbrushed onto his face, was used to draw a parallel between the Mad Sculptor and one of the country’s most notorious criminals. Juxtaposing this doctored photo with a strikingly similar portrait of America’s former Public Enemy No. 1, the Daily News ran a piece describing Irwin as the “crime-twin of John Dillinger”—“a Dillinger of Sex.” This time, the paper’s go-to expert was Dr. William Moulton Marston, a noted psychologist who, a few years later, would enter into pop culture lore as the creator of the comic book character Wonder Woman. According to Dr. Marston, the two killers were “similar in almost every external respect. Both have the same bulging foreheads, distended nostrils, heavy-lobed ears, and thinning hair.” His “microscopic study” of the two faces showed conclusively that “Irwin’s murders for sex” were “the twin of Dillinger’s murders for money.”6 "

― Harold Schechter , The Mad Sculptor: The Maniac, the Model, and the Murder that Shook the Nation