Verkkopolice went into the apartment and found the key to the handcuffs, as well as the knife in dahmer’s room. Law enforcement also discovered around 80. Verkkocriminal psychologists who interviewed dahmer suggested the demented killer posed and photographed his victims to stimulate his obsession with sexual sadism and necrophilia. Verkkohis terrifying killing spree may have gone under the radar for nearly a decade, but one piece of evidence eventually led to his arrest: