Jolly Jane Toppan: The MGH Nurse Turned Mass MurdererYou are here:HomeHistoryEraImmigrant NeighborhoodJolly Jane Toppan: The MGH… A medical serial killer in the late 19th and early 20th century, Jane Toppan (1857-1938) admitted to the murders of 31 people and was possibly responsible for many more deaths. Toppan, a child of Irish immigrants and a trained