March 31, 1922, marked the beginning of a mystery that endures till date. On this day, the family members of Andreas Gruber and their maid were brutally murdered using a pick axe. The murderer targeted the head and each blow was given with precise confidence.
All four Adults except two-year-old Josef and the newly arrived maid Maria were lured into a barn and slaughtered one by one. The child was killed in his crib while the maid was found dead in her room.
The bodies in the barn were neatly stacked one upon the other. They were covered with hay.