Content warning: This factual case article discusses multiple homicide, child victims and disturbing crime-scene evidence.
In the spring of 1922, six people were murdered at Hinterkaifeck, an isolated Bavarian farmstead roughly seventy kilometres north of Munich.
The killer was never identified.
What made the case especially disturbing was not only the violence. Evidence indicated that someone remained at or returned to the property after the deaths—feeding livestock, using the house and allowing smoke to rise from the chimney while the victims lay undiscovered.
More than a century later, the Hinterkaifeck murders remain among Germany’s most famous unsolved crimes.
The people at Hinterkaifeck
The farm was occupied by Andreas Gruber, sixty-three; his wife Cäzilia, seventy-two; their widowed daughter Viktoria Gabriel, thirty-five; and Viktoria’s children, seven-year-old Cäzilia and two-year-old Josef.
A new maid, Maria Baumgartner, arrived on March 31, 1922. She would spend only a few hours at Hinterkaifeck before being killed with the family.
Warnings before the murders
Later accounts described unsettling events in the days before the crime.
Andreas reportedly found an unfamiliar newspaper on the property. He was also said to have discovered footprints in snow leading from the forest toward the farm, without a clear trail returning.
The family heard noises in the attic and noticed signs that someone might have interfered with a lock or entered an outbuilding.
These details are central to the legend of a killer secretly living above the family. However, surviving records and witness statements are incomplete, and some details were repeated years later. They should be treated as reported observations rather than proof that a hidden intruder occupied the attic.
The night of March 31
Investigators believed the killings occurred on the evening of March 31.
Four victims appear to have entered the barn area separately: Andreas, Cäzilia, Viktoria and young Cäzilia. Their bodies were later found close together and partly covered.
Maria Baumgartner was killed in her room. Two-year-old Josef was killed in his cot.
The weapon was associated with a mattock or heavy agricultural tool belonging to the farm.
No reliable account explains why four family members went to the barn one after another. Restless livestock, a suspicious sound or concern for another person may have drawn them there.
Days of silence
The family failed to appear at church. Young Cäzilia did not attend school. Mail accumulated. Visitors received no answer.
Yet neighbours observed signs that the farm was not entirely inactive.
Livestock had been fed. Food appeared to have been used. Smoke reportedly came from the chimney.
If those observations were accurate, the killer may have remained on the property for a period after the murders.
This is the feature that gives Hinterkaifeck its uniquely claustrophobic horror: the crime did not necessarily end when the victims died. Someone may have moved through the rooms, tended animals and eaten food while the bodies remained nearby.
The discovery
On April 4, concerned neighbours entered the farm.
They discovered the four victims in the barn before finding Maria and Josef inside the house.
The scene was quickly compromised. Numerous people entered before modern evidence-preservation practices could be applied. Objects were moved, and the farm attracted crowds.
Robbery did not fit
Money and valuables remained at the property, weakening a simple robbery motive.
The killer also appeared familiar with the farm’s layout and routines. That encouraged theories involving a neighbour, relative, former worker or person with a close connection to Viktoria.
However, familiarity could also have been gained through observation. No single motive—money, revenge, paternity, family conflict or obsession—has been proved.
The murder weapon
The farm was demolished in 1923.
During demolition, a bloodstained mattock believed to be the murder weapon was found hidden in the attic structure. Its discovery strengthened the idea that the perpetrator knew the building and had enough time to conceal evidence.
By then, however, the weapon could not provide the microscopic or DNA evidence expected from a modern investigation.
Major suspects
Several people came under suspicion over the years.
A frequently discussed figure was neighbour Lorenz Schlittenbauer, who had previously had a relationship with Viktoria and may have believed he was Josef’s father. His behaviour at the discovery scene was later described as unusual, though retrospective judgments are unreliable.
Other suspects included travelling labourers, former soldiers, criminals and people connected to the family.
The investigation generated files and interrogations for decades. No suspect was convicted.
It is important not to turn suspicion into guilt. The surviving record does not justify presenting any named person as the killer.
The child in the barn
One of the most distressing findings concerned seven-year-old Cäzilia.
Evidence suggested that she may have survived the initial attack for some time. She had pulled out portions of her hair while trapped beside the bodies.
This matters because it indicates that the crime scene may not have become silent immediately. The killer may have been elsewhere on the same property while a wounded child remained alive.
Fact, reconstruction and legend
- Six people were murdered at an isolated farm.
- The killings were probably committed with a farm tool.
- The bodies were not discovered for several days.
- Animals were cared for and the property showed signs of activity after the likely time of death.
- Money remained, leaving the motive unclear.
- A suspected murder weapon was later recovered from the attic.
- No one was convicted.
Why the case remains frightening
Many unsolved murders are terrifying because the offender vanished. Hinterkaifeck is terrifying because the offender may not have hurried.
After killing six people, the perpetrator appears to have behaved as though the property belonged to them. They may have listened when visitors approached, watched the road and known exactly when to leave.
Sources and further reading
Read more documented investigations in True Cases.