Serial murderers are rare offenders, and this, coupled with challenges to accessing data about them, poses a significant challenge to empirical investigation. It is also true that female serial murderers are thought to be rarer than their male counterparts and have often been excluded from being labeled "serial murderers" due to narrowly constructed definitions. Thus, female serial murderers are an even more elusive population to study. The results of this exploratory analysis, using newspaper articles to gather data about the crimes of a subset of 10 female serial murderers in the United States, suggest that not only are these women different from men who commit serial murder but also that the scant information published about these rare offenders may have underestimated the female serial murderer in terms of both offender and offense characteristics. (Published Abstract)