Hinterkaifeck murders

The Hinterkaifeck murders occurred on the evening of 31 March 1922, when six inhabitants of a small Bavarian farmstead, located approximately north of Munich, Germany, were murdered by an unknown assailant. The six victims were Andreas Gruber (aged 63) and Cäzilia Gruber (aged 72); their widowed daughter Viktoria Gabriel (aged 35); Viktoria's children, Cäzilia (aged 7) and Josef (aged 2); and the maid, Maria Baumgartner (aged 44). They were all found struck dead with a mattock also known as grub axe. The perpetrator (or perpetrators) lived with the six corpses of their victims for three days. The murders are considered one of the most gruesome and puzzling unsolved crimes in German history.

Four of the dead bodies were stacked up in the barn, the victims having been lured into there one by one. Prior to the incident, the family and their previous maid reported hearing strange sounds coming from the attic, which led that maid to quit. The case remains unsolved to this day. Provided by Wikipedia