From May 1871 through December 1872, the Bender family—better known as the Bloody Benders—operated as a family of serial killers in Labette County, Kansas, in the United States. John Bender, his wife Elvira, their children, John Jr. and Kate, made up the family. The Bender family appeared seemingly out of thin air, carried out horrifying and uncountable acts of heinous brutality, and then vanished without a trace.

Source Materials:

https://slate.com/news-and-politics/2022/03/bloody-benders-true-story-kate-bender-crimes-susan-jonusas.html

https://www.legendsofamerica.com/ks-benders/

https://crimereads.com/the-bloody-benders-americas-first-family-of-serial-killers/

https://allthatsinteresting.com/bloody-benders

https://nypost.com/2022/03/26/how-a-serial-killer-family-murdered-8-and-got-away-with-it/

https://www.historicmysteries.com/bloody-benders/

Hell's Half-Acre : The Untold Story of the Benders, America's First Serial Killer Family by Susan Jonusas