Hinterkaifeck Murders
Six individuals were murdered in 1922 on a rural farm in Bavaria, some 40 miles from Munich. When neighbors were worried that one of the children had not been attending school and the entire family had skipped church, they searched the area and found Viktoria Gabriel, her elderly parents, her two children, and the maid.
The barn contained the four oldest family members. Their deaths had been caused by a mattock, a weapon resembling a pickax. Along with the maid, the youngest child's body was discovered inside the home. Her first day on the job had been that day. When the previous maid left, she was said to have believed the farm to be haunted after hearing noises in the attic.
Later evidence suggested that the perpetrator had resided in the home, maybe spending some time hiding in the attic. Evidence may have been lost because so many individuals had visited the location between the time the deaths were discovered and the start of the investigation. The bodies weren't found until at least four days after the killings.
Each victim had not only been murdered, but also severely abused. Some of them were repeatedly bashed by the murderer. The daughter didn't pass away right away and probably lived for hours despite her wounds. Unbelievably, the farm animals and the family dog weren't just left alone—someone even looked after them for a few days.
There was still a significant amount of money in the house, and nothing was taken. Despite numerous suspects being detained over the years, no one has ever been convicted of the crime. The matter was still being looked into as recently as 2007, however there wasn't any fresh information.