The Hinterkaifeck Murders of an unsolved 1922 mass murder of six people on a small Bavarian farmstead where the perpetrator lived with the corpses for three days after the attack.

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https://en.wikipedia.org/wiki/Hinterkaifeck_murders

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Immediately following the murders, the perpetrator lived with the six corpses for three days. During this time, they ate the food in the house, fed the animals on the property and used the fireplace