 They conclude the murderer was Paul Mueller (or Miller), an immigrant possibly from Germany who was the subject of an unsuccessful yearlong manhunt as the sole suspect in the 1897 murder of a family in West Brookfield, Massachusetts, who had employed him as a farmhand.James started his research in an attempt to solve the Villisca murders, and with his daughter found archival newspaper stories detailing dozens of families murdered under similar circumstances across the US.The Jameses thus believe that Mueller was guilty of the Villisca murders as part of a killing spree that lasted over a decade, killing at least 59 people in 14 separate incidents, including the Colorado Springs and Paola crimes.