Three Essex women were accused of poisoning their family members in the mid-19th century. While their crimes were not out of the ordinary, the legal responses to these three women were irregular and highlight how female deviance was a concern to the legal system in England during the 19th century. Historians have embraced the possibility of studying crime and violence in order to better understand how societies and their legal systems responded to deviance (real or perceived). This paper presents the cases of the three Essex poisoners, as well as the narratives created in the courtroom to explain their deviance, and illustrates how and why criminologists should turn to historical criminal cases in order to further criminological understandings of crime and violence.