Karl Denke never stood trial. He died in a police cell in the Silesian town of Münsterberg on the evening of December 21, 1924, a few hours after his arrest, and the case against him was never put to a court. Everything known about what happened in his house comes from what the police found there after his death, from the reports of a forensic laboratory in Breslau, and from the local and national newspapers of the winter of 1924 and 1925.
What they found was enough for investigators to attribute the deaths of at least 20 people to him, most of them homeless men passing through the town in search of work. Later estimates by historians and journalists run to 30 or 40. Denke was a man in his fifties who lived alone, went to church, helped at funerals and gave beggars a bed for the night. The town called him Father Denke. The case came to light only because one of the men he took in, a journeyman named Vincenz Olivier, got away.
Münsterberg, now Ziębice in southwestern Poland, was a small German market town in Lower Silesia in the 1920s, about 50 kilometers from Breslau, the regional capital now called Wrocław. The Czech broadcaster CNN Prima News, in a 2024 account based on the Czech and German press of the time, put its population then at about 9,000 and its distance from today's Czech border at 27 kilometers. The historian Lucyna Biały of the University of Wrocław, who wrote the first scholarly account of the case in 2001, described an orderly provincial town that was the seat of its district until 1932. It had a town orchestra, a theater society that staged Goethe's Iphigenia in Tauris at the Schützenhaus on Christmas Day 1924, and an open-air cinema before the First World War.
The town kept the name Münsterberg until 1945 and has been the Polish town of Ziębice since. The case was soon forgotten, Biały writes, and she reconstructed it from the surviving issues of the Münsterberger Zeitung, the Frankenstein-Münsterberger Zeitung, the Breslauer Gerichts-Zeitung, the Schlesische Zeitung and other papers.
Little about Denke's early years is certain. Biały gives his date of birth as August 12, 1870, and describes him as the second son of a fairly prosperous farmer in a Lower Silesian village whose name she could not establish. The City of Wrocław's news portal, reporting in 2014 on researchers at the University of Wrocław, gives his birthplace as Kalinowice Górne, a village near Münsterberg then called Oberkunzendorf, and says his teachers considered him slow to develop.
According to Biały, he did poorly at school, ran away from home at the age of 12 and did so again more than once. He was then apprenticed to a gardener. When his father died, Denke was 25. His elder brother took over the family farm, and Karl was paid his share in money. He used it to buy a farm and garden in Münsterberg, but he managed them badly and had to sell.
Denke then bought a single-story house at Teichstrasse 10, the street now called ul. Stawowa. He lived on the ground floor and let the rest. In the inflation and economic collapse that followed the First World War he lost his savings and had to sell the house, Biały writes, but he went on living in it as a tenant. The City of Wrocław portal adds that after losing his savings he worked in the meat trade. Other families lived in the building with him; Radio RAM, a station of the public broadcaster Radio Wrocław, reported in 2014 that they later told investigators they had known nothing of what went on in his rooms.
He made his living as a peddler. He held a permit to sell door to door, and he sold leather straps, braces and shoelaces, as well as meat and bones, according to Biały and Radio RAM. CNN Prima describes him as a butcher's helper who also played the organ in church; Biały describes him only as a peddler. He did not drink or smoke, and he was not known to have had any relationship with a woman.
To his neighbors he was calm, orderly, pedantic and devout. He carried the cross in funeral processions, according to CNN Prima, and he was known for his kindness to the poor. He gave food, small jobs and a night's lodging to beggars and men on the road, and many accepted during the hard years of the hyperinflation, Gazeta Wrocławska wrote in 2025. The Wrocław daily wrote that this was how he became "Ojczulek Denke," Father Denke, one of the more respected residents of the town. CNN Prima, drawing on the Czech press of 1925, reports that neighbors described him as very modest, rather limited, very quiet, poorly dressed and often at church.
Biały found one other glimpse of him from before 1924. In January 1925 Max Gruschwitz, a Breslau activist of the Independent Social Democratic Party, wrote in the newspaper Die Tribune that he had met Denke at a political meeting in Münsterberg in 1920. Denke offered him a place to stay for the night, and Gruschwitz declined.
On Saturday, December 20, 1924, an unemployed journeyman named Vincenz Olivier arrived in Münsterberg. Biały, citing the local papers, gives his date of birth as February 8, 1883, and his birthplace as Strzelin, a town in the same part of Silesia. The newspapers of the time and later writers differ on his trade: CNN Prima and Gazeta Wrocławska call him a carpenter or joiner looking for work, while Julius Polke, who wrote about the case in the Archiv für Kriminologie in 1934, called him a stonemason, Biały notes.
The next day, a Sunday in Advent, Olivier went begging in the town. The wife of a teacher named Voigt, who lived next door to Denke, gave him 20 pfennigs. Denke invited him in. He offered Olivier 20 pfennigs more to write a letter for him, saying, as Gazeta Wrocławska reports, that his eyes were not what they had been. Olivier sat down to write while Denke dictated from behind him.
The words Denke dictated made no sense for a letter. CNN Prima, following the Czech newspapers of the day, says the phrase was an insult addressed to someone called Adolf. Olivier laughed and turned around, and that movement let him partly avoid a blow from a heavy, sharpened hoe that Denke had raised over him. CNN Prima places the attack around noon.
Olivier, bleeding from the head, wrestled the hoe away from Denke, got to the door and shouted for help. Other people in the building heard him. Two sons of a neighbor came, and so did the teacher Voigt, to whom Olivier handed the bloodied hoe, according to Biały. Denke told them that Olivier had tried to rob him and that he had defended himself.
Olivier went to the police and reported the attack at about 1 p.m., Biały writes. The police did not believe him at first. A commissioner, whom the newspapers do not name, dismissed his account, and it was Olivier, a vagrant without papers or money, who was locked up, although he was given medical treatment for his wound. The City of Wrocław portal says he ran into the station covered in blood.
The seriousness of the wound counted for more than the reputation of the man accused of causing it. Police went to the house on Teichstrasse and took Denke into custody. He was put in a cell at the police station. CNN Prima says that at the time the police had not finished looking through his flat.
At about 9:30 that evening, Sergeant Palke found Denke hanged in his cell. He had used a handkerchief. Biały takes the time and the sergeant's name from the local press; CNN Prima, using the Czech papers, gives about 9 p.m. and notes that men's handkerchiefs of the period were large, often half a meter across. The City of Wrocław portal says guards found him some hours after his arrest.
Denke had answered no questions on the record. He left no statement, no confession and no explanation. With his death the criminal case against him ended before it had begun, and no court ever heard the evidence against him or any defense.
Olivier, meanwhile, was questioned on December 22. On January 15, 1925, he was tried as a beggar and vagrant under Section 361 of the German criminal code and sentenced to 10 days in jail, Biały writes.
On December 22, Denke's relatives asked the police for his body and for permission to bury him. On Wednesday, December 24, Christmas Eve, officers went to his rooms. The purpose, according to Biały's reading of the local papers, was to secure his belongings, not to search for evidence.
What they found led to a criminal investigation. Biały lists, from the newspaper reports of the following days, vessels of meat preserved in salt, human bones that had been prepared, straps and braces said to be made of human skin, clothing marked with blood, a collection of 420 human teeth, and identity papers belonging to other people. Police also found equipment that the papers described as being for making soap.
The first reports, which the Prague daily Československá republika took from the Breslauer Neueste Nachrichten and printed at the turn of the year, said that a wooden tub in a stable building held salted meat, and that medical experts had found it to come from five different men. They also mentioned a bowl of human fat. CNN Prima, which reviewed these reports in 2024, adds that the braces Denke was wearing were said to be made of human skin, and that clothing belonging to the dead was found in his wardrobe. The City of Wrocław portal says the first officers in the house found human bones in many places, dozens of identity documents on a windowsill and cupboards full of bloodstained clothing.
The meat was sent to a forensic laboratory in Breslau. Chemists there found it to be human flesh from three different people, Biały writes, citing the Frankenstein-Münsterberger Zeitung of December 28 and 30, 1924. The Prague evening paper Večer reported on January 15, 1925, that meat from a pot in the flat had been confirmed as human after close examination, and CNN Prima cites a report by the head of the Breslau Institute of Forensic Medicine on meat found in three pots. The figure of five men, from the earliest reports, and the laboratory's figure of three people both appear in the record; the record does not reconcile them.
The documents in the flat were the investigators' main way of putting names to the dead. Biały describes what the local papers reported. A release card from the prison in Zielona Góra belonged to Hermann Müller, a locksmith. A discharge slip from a hospital in Strzelce Opolskie belonged to Johann Thomalla. There were receipts in the names of Karl Seidel and Kaspar Hubalek, and a membership book from a Catholic craftsmen's association in the name of Adolf Salisch, a confectioner.
From these papers and other leads, the police identified 20 people whose deaths they attributed to Denke, Biały writes. Johann Thomalla, whose hospital slip was found, was not included in the official list. The Czech papers of late December 1924, as summarized by CNN Prima, reported that Denke's work books and other documents pointed to killings over about ten years and at least 15 victims.
Biały gives the names and trades of the 20 people on the police list: Heinrich Bruchmann, a carpenter; Franz Neiss, a day laborer; Johann Klose, a tailor; Robert Lorenz, a butcher; Ewald König, a tailor; Paul Lux, a laborer; Johann Gröger, a tailor; Emil Exner, a farmer; Josef Nierlich, a weaver; Hermann Müller, a locksmith; Oskar Heinzel, a laborer; Julius Busch, a baker; Wilhelm Rathmann, a laborer; Karl Becker, a painter; Hermann Kuschinke, a gardener; Adolf Salisch, a confectioner; Karl Seidel, a farmer; Friedrich Lazina, a baker; Max Heidenreich, a blacksmith; and Kaspar Hubalek, a laborer.
Little more than these names and trades was reported. The reports do not give ages, home towns or the dates on which these men disappeared. Most were journeymen and laborers who had lost their work, and some had just come out of a prison or a hospital. They were men who traveled from town to town looking for work, or for a meal and a bed, and many had no one waiting for them. CNN Prima notes that their disappearances drew little attention partly because so many German families were still searching for relatives missing since the First World War. Denke often looked for them at the railway station, according to the City of Wrocław portal and CNN Prima.
How many more there were is not known. Biały writes that the true total was estimated at about 40 and may have included women. Maciej Trzciński, a professor in the forensic science department at the University of Wrocław, put the estimate at about 40 in 2014. CNN Prima gives a range of 30 to 40, and Gazeta Wrocławska in 2026 wrote that there may have been more than 40. None of these figures was ever tested in court.
After his death, people in the house began to put together things they had noticed. The Gabriel family, who lived upstairs, told the papers they had heard sawing and chopping at night and had seen Denke pour away bloody water. They had assumed he was killing dogs, because dog skins could be seen in his rooms, Biały writes. Radio RAM reported in 2014 that when he was asked where blood came from, Denke said he killed stray dogs. CNN Prima, drawing on the Czech reports of the time, says the most his neighbors had suspected him of was killing stray dogs.
Biały also records a later report that a neighbor had spoken, two years earlier, with an injured beggar who said Denke had hurt him. That man never went to the police, the report said, for fear of being punished himself under the vagrancy law. The same law was used against Olivier after he did report the attack.
The most often repeated claim about Denke is that he sold human flesh as pork at the market in Breslau. The claim has been part of the story since 1924, and it is still printed as fact in the Polish press. Gazeta Wrocławska wrote in 2025 and again in 2026 that he sold preserved meat at the Hala Targowa, the city's market hall, labeled as pork. The City of Wrocław portal in 2014 said he allegedly sold the flesh and skin of his victims in Wrocław as veal and pork. Maciej Trzciński told Radio RAM that Denke processed the bodies and sold the products, including at the Hala Targowa. Juliusz Woźny, writing in Gazeta Wrocławska in 2016, said that according to the police investigation Denke ate the meat himself and also sold it in Wrocław. CNN Prima says he sold meat on the black market in Breslau, but gives no source for the statement.
There was doubt at the time. Biały reports that the association of meat sellers denied that human meat could have been sold, because of police controls on the trade. No sale was ever proved, and no buyer was reported. CNN Prima concludes that whether Denke himself ate the flesh is a question only he could have answered.
What the record supports is narrower. Human flesh, fat and bones were found in his rooms, and a forensic laboratory confirmed that the meat was human. That the flesh was eaten, and that it was sold, rests on the conclusions police and the press drew from those findings, and on rumor.
The case set off alarm well beyond Münsterberg. The newspapers reported a wave of stomach complaints across the region and a fall in meat sales, Biały writes. CNN Prima says people in Münsterberg avoided sausage and other meat products for months, and that the town's canning factory went bankrupt because its owners could not dispel suspicion that they had bought meat from Denke. Trzciński told Radio RAM that for years people distrusted canned meat and meat sold in jars.
The case broke while another was in the German news: the trial of Fritz Haarmann in Hanover had opened on December 4, 1924, Biały notes, and Gazeta Wrocławska writes that German papers of the time were full of reports of cannibals. Biały places Denke beside Haarmann, Fritz Angerstein and Peter Kürten, the most widely reported German cases of the 1920s, and argues that the Münsterberg case was among the worst of them yet was quickly forgotten and left out of the standard compendia of crime.
Coverage in the German press was restrained and soon faded, Biały writes. Left-wing papers, among them the Schlesische Bergwacht in 1925 and the Volkswacht in 1931, accused the authorities of wanting the case forgotten, and of police negligence, saying the police had been more interested in watching political activists than in the disappearance of poor men on the roads. The City of Wrocław portal reported in 2014 that the German authorities were said to have played the case down for fear of panic.
Denke was buried on December 31, 1924, at 6:30 in the morning, in an unmarked grave in a corner of the Münsterberg cemetery, with police present, according to the Münsterberger Zeitung as cited by Biały. In 1928 the town leased the field, garden and shed at the Teichstrasse property to a local man named Ratzky, the same paper reported. Biały gives no information on what became of the house itself.
The house still stands. Its address is now ul. Stawowa 13; at the time of the case it was numbered 10, CNN Prima notes. In the 1970s human remains were still being found on the property, CNN Prima reports.
In October 2014 researchers from the forensic science department at the University of Wrocław said they wanted to examine the house and its grounds. Maciej Trzciński told the City of Wrocław portal that the house and its surroundings had never been examined archaeologically, and that neither the soil nor a neighboring pond had ever been searched. He believed remains could still be there, and that modern methods could locate them and allow DNA analysis to identify the dead. At the time of the report, the family that owns the property had not agreed to the work. No later search was reported.
Biały's 2001 article in Litteraria, published by the Wrocław Scientific Society, was the first modern account of the case, and in 2014 Radio RAM credited her with first describing it. She told the station it was important not to leave the painful parts of a town's history out of the record. Jarosław Żurawski of the Museum of Household Appliances in Ziębice also spoke to the station for its 2014 report.
The case has since drawn writers and filmmakers. In 2014 the German publisher Carlsen published Vasmers Bruder, a graphic novel by the writer Peer Meter and the artist David von Bassewitz, in which a man researching the Münsterberg case loses himself in it. Denke himself barely appears in the book. Christian Schlüter of the Frankfurter Rundschau praised it highly in March 2014; Christoph Haas of the Süddeutsche Zeitung, in May 2014, found it decent but heavy in its symbolism. Gazeta Wrocławska has recommended a Polish documentary, Karl Denke: Bestia z Ziębic, on the investigation, and in 2025 its video series on the history of Wrocław took up the story of the market hall.
Never tried: Denke was never charged with any offense. He died the evening he was arrested, and no court examined the evidence or heard a defense. Each of these deaths is attributed to him by police, journalists and historians, not proved.
What the record shows: Vincenz Olivier was struck on the head in Denke's flat on December 21, 1924, and escaped. Human remains, human teeth and preserved meat that a Breslau laboratory confirmed as human were found in Denke's rooms, with the identity papers of several missing men. Police identified 20 people whose deaths they attributed to him.
How many: 15 or more over about ten years (Czech press of late December 1924, from the Breslau papers); 20 identified (police, as reported by Biały, the City of Wrocław portal and Gazeta Wrocławska); about 40 estimated (Biały; Trzciński); 30 to 40 (CNN Prima). The higher figures are estimates.
How many people the meat came from: five men, according to the first newspaper reports; three people, according to the Breslau laboratory as reported in the Frankenstein-Münsterberger Zeitung.
Eating and selling: the claims that Denke ate human flesh, served it to others and sold it as pork in Breslau were made by police and the press in 1924 and 1925 and have been repeated since. The meat sellers' association denied it at the time. No sale or buyer was reported.
His birth: Biały gives August 12, 1870, and could not identify his village; the City of Wrocław portal names Kalinowice Górne (Oberkunzendorf). CNN Prima describes him as 54 in 1924.
The time of death: about 9:30 p.m. (Biały, from the local press) or about 9 p.m. (CNN Prima) on December 21, 1924. The City of Wrocław portal says he was found "in the morning."
Olivier's name and trade: Vincenz Olivier in Biały and CNN Prima; Vincenzo Olivier on the City of Wrocław portal; Vincent Olivier in Gazeta Wrocławska. A journeyman, a carpenter or joiner, or a stonemason, depending on the source.
August 12, 1870: Karl Denke is born in Lower Silesia, according to Biały.
Date not given: after his father's death, when Karl is 25, his elder brother takes the family farm; Karl buys property in Münsterberg with his share.
Later: he buys the single-story house at Teichstrasse 10, Münsterberg, and lives on the ground floor.
1920: Max Gruschwitz meets him at a political meeting in Münsterberg and declines his offer of a bed.
Early 1920s: Denke loses his savings in the inflation, sells the house and stays on as a tenant.
December 4, 1924: Fritz Haarmann's trial opens in Hanover.
December 20, 1924: Vincenz Olivier arrives in Münsterberg.
December 21, 1924, around noon: Olivier is struck with a hoe in Denke's flat and escapes; he reports the attack to police at about 1 p.m.
December 21, 1924: Denke is taken into custody; at about 9:30 p.m. he is found hanged in his cell.
December 22, 1924: Olivier is questioned; Denke's relatives ask for his body.
December 24, 1924: police enter Denke's rooms and find human remains, preserved meat and the papers of missing men.
Late December 1924: the Breslau laboratory confirms that the meat is human; the case is reported across Germany and in Czechoslovakia.
December 31, 1924, 6:30 a.m.: Denke is buried in an unmarked grave in Münsterberg.
January 15, 1925: Olivier is sentenced to 10 days in jail for vagrancy; Večer reports that meat from the flat has been confirmed as human.
January 1925: Gruschwitz's account appears in Die Tribune.
1928: the town leases the property's field, garden and shed to a local man.
1945: the name Münsterberg gives way to the Polish Ziębice.
1970s: human remains are found on the property.
2001: Lucyna Biały publishes the first scholarly account of the case.
2014: University of Wrocław researchers propose examining the house; the owners have not agreed; Vasmers Bruder is published.
December 21, 2024: CNN Prima News marks the centenary of the case.