Joachim Kroll was one of Germany's most disturbing serial killers of the postwar era. For more than two decades, Kroll murdered women and children across western Germany while maintaining the appearance of an unremarkable, quiet neighbor.
Known by the chilling nicknames “The Ruhr Cannibal” and “The Duisburg Man-Eater,” Kroll committed his first known murder in 1955 and continued killing until his arrest in 1976. He was ultimately convicted of eight murders and one attempted murder, although he confessed to a total of 14 murders.
His case became notorious not only because of the brutality of his crimes, but because several unrelated murders had initially been blamed on other people. The eventual discovery of Kroll's crimes exposed a serial murder investigation that had remained fragmented for years.
Who Was Joachim Kroll?
Joachim Georg Kroll was born on April 17, 1933, in Hindenburg, Upper Silesia, then part of Germany. After World War II, his family relocated to North Rhine-Westphalia.
As an adult, Kroll eventually settled in the Ruhr region, one of Germany's largest industrial areas. He worked a number of relatively ordinary jobs, including employment as a washroom attendant at industrial facilities.
To people who encountered him in everyday life, Kroll did not necessarily appear to be the kind of person capable of committing multiple murders.
He lived alone and maintained a relatively quiet existence in Duisburg. According to contemporary reporting, he was known around his neighborhood and was regarded by some local children as a friendly figure.
Behind that ordinary exterior, however, Kroll was beginning a killing spree that would continue for approximately 21 years.
When Did Joachim Kroll Start Killing?
Kroll's first known murder occurred in February 1955.
His victim was 19-year-old Irmgard Strehl, who was attacked near Lüdinghausen. Her death marked the beginning of a series of murders that would eventually stretch across the Ruhr region and surrounding areas.
Over the following two decades, Kroll attacked victims in different towns and cities rather than concentrating his crimes in one location.
That geographic separation was one of the factors that helped keep the murders from immediately being connected to a single perpetrator.
By the time Kroll was finally arrested in 1976, investigators were confronted with a trail of killings stretching back to the 1950s.
Joachim Kroll Victims
One of the most frequently searched aspects of the case is the question: How many people did Joachim Kroll kill?
The answer depends on whether you are referring to the crimes for which he was convicted or the murders he confessed to.
Kroll was convicted of eight murders and one attempted murder. During police questioning, however, he confessed to 14 murders. Not every confession could be established to the standard required for a criminal conviction.
The victims attributed to Kroll in his confessions included:
Irmgard Strehl, 19 — killed in 1955
Erika Schuletter, 12 — killed in 1956
Klara Frieda Tesmer, 24 — killed in 1959
Manuela Knodt, 16 — killed in 1959
Petra Giese, 13 — killed in 1962
Monika Tafel, 12 — killed in 1962
Barbara Bruder, 12 — disappeared in 1962 and was never found
Hermann Schmitz, 25 — killed in 1965
Ursula Rohling, 20 — killed in 1966
Ilona Harke, 5 — killed in 1966
Maria Hettgen, 61 — killed in 1969
Jutta Rahn, 13 — killed in 1970
Karin Toepfer, 10 — killed in 1976
Marion Ketter, 4 — killed in 1976
The circumstances surrounding individual cases varied, and not all of Kroll's confessions were ultimately proven in court. Contemporary German reporting emphasizes that the prosecution ultimately concerned eight murders and one attempted murder.
The Innocent People Blamed for Kroll's Crimes
One of the most disturbing aspects of the Joachim Kroll case is that several other people were investigated or convicted in connection with murders later attributed to Kroll.
For example, Heinrich Ott was arrested in connection with the 1959 murder of Klara Tesmer. He subsequently died while in custody.
Other men were also suspected in cases that Kroll later confessed to. Some faced devastating consequences despite not being responsible for the murders.
The situation demonstrated a major problem confronting investigators: Kroll's crimes were spread across different communities and separated by long periods of time.
Instead of appearing to be the work of one serial killer, the individual murders initially looked like separate crimes committed by different people.
This helped Kroll remain undetected for years.
Why Was Joachim Kroll Called the “Ruhr Cannibal”?
The nickname “Ruhr Cannibal” came from one of the most disturbing elements of the case.
Kroll admitted that he removed portions of some victims' bodies and consumed them.
The bizarre claim he reportedly gave investigators was that eating portions of his victims helped him save money on food.
His cannibalism became a defining part of the public image surrounding the case, leading German newspapers to give him sensational nicknames including “Menschenfresser von Duisburg,” roughly translated as “Duisburg Man-Eater.”
It is worth remembering that newspaper coverage of the case was highly sensationalized. Contemporary reporting shows that the number of suspected victims changed repeatedly during the investigation, with newspapers at various points reporting considerably different figures.
Joachim Kroll in Duisburg
Duisburg became particularly important to the Joachim Kroll case.
Kroll eventually lived in the Duisburg district of Laar, where he occupied an apartment and worked in the industrial Ruhr area.
Nothing about his ordinary lifestyle necessarily revealed the crimes he had committed.
That contrast between Kroll's outwardly mundane existence and his hidden criminal life became one of the most unsettling elements of the case.
For years, he was simply another resident of a heavily industrialized community.
Then, in July 1976, everything changed.
How Was Joachim Kroll Arrested?
The arrest of Joachim Kroll was triggered by the disappearance and murder of four-year-old Marion Ketter.
On July 3, 1976, police were investigating the missing child when attention turned to Kroll's apartment building.
A problem with the building's plumbing ultimately became a crucial clue.
A neighbor reported that a drain was blocked and that human remains appeared to be involved. Police searched Kroll's apartment and discovered evidence connecting him to the murdered child.
The discovery immediately transformed the investigation.
Kroll was arrested on July 3, 1976.
What investigators found in his apartment exposed a crime scene unlike anything they had expected to encounter.
Joachim Kroll's Confession
After his arrest, Kroll began talking to investigators.
He admitted responsibility for Marion Ketter's murder and eventually described numerous other killings dating back to the 1950s.
According to contemporary reporting, investigators initially believed they had uncovered only part of the story. Kroll continued providing information about additional murders, creating a case that stretched across two decades.
Kroll eventually confessed to 14 murders, although prosecutors were unable to establish every confession as a proven murder case.
This distinction is important when discussing the Joachim Kroll victims.
It is accurate to say that Kroll confessed to 14 murders, but it is not accurate to claim that he was legally convicted of all 14.
The Joachim Kroll Trial
Kroll's trial became one of the major criminal cases in Duisburg.
Proceedings began in 1979 and ultimately lasted for more than 150 trial days. The prosecution focused on eight murders and one attempted murder.
The case involved decades of criminal activity, multiple locations and conflicting evidence surrounding some of the killings.
On April 8, 1982, Kroll was found guilty of eight murders and one attempted murder.
He received life imprisonment.
How Did Joachim Kroll Die?
Joachim Kroll spent the remainder of his life in prison.
He died on July 1, 1991, at the age of 58 after suffering a heart attack while imprisoned at Rheinbach.
He never returned to society.
By the time of his death, his name had become permanently associated with one of the most disturbing serial murder cases in modern German criminal history.
Why Did Joachim Kroll Remain Undetected for So Long?
One of the biggest questions surrounding the Joachim Kroll case is how someone could kill repeatedly for more than two decades without being caught.
There was no single explanation.
Kroll operated across a large geographic area, and his murders were separated by months or years. Different police departments investigated individual cases, while other suspects were sometimes considered responsible.
The lack of an obvious connection between the murders allowed Kroll to remain outside the focus of investigators.
The case also illustrates how difficult serial murder investigations can be when crimes occur across multiple jurisdictions and over long periods.
By the time Kroll was arrested in 1976, investigators were effectively reconstructing a criminal history that had begun more than 20 years earlier.
The Legacy of the Joachim Kroll Case
The story of Joachim Kroll remains notorious in Germany because of the sheer length of his alleged killing spree and the disturbing circumstances surrounding his crimes.
But the case is also about investigative failure, mistaken suspects and the difficulty of recognizing a serial offender when individual crimes appear unrelated.
Kroll was not a famous criminal celebrity during his years of killing. He was an apparently ordinary man living and working in the Ruhr region.
That ordinariness was part of what allowed him to hide in plain sight.
His eventual arrest demonstrated how a seemingly minor clue could unravel years of unsolved crimes.
Joachim Kroll: Key Facts
Full name: Joachim Georg Kroll
Born: April 17, 1933
Birthplace: Hindenburg, Upper Silesia
Active: 1955–1976
Primary region: Ruhr region, West Germany
Known as: The Ruhr Cannibal; The Duisburg Man-Eater
Confessed murders: 14
Murders convicted: 8
Attempted murder conviction: 1
Arrested: July 3, 1976
Sentenced: Life imprisonment
Convicted: April 8, 1982
Died: July 1, 1991
Cause of death: Heart attack
Final Thoughts
Joachim Kroll was a German serial killer whose crimes remained hidden for more than 20 years. Beginning in 1955, he killed victims across the Ruhr region and surrounding areas before his arrest in 1976.
Although Kroll confessed to 14 murders, he was ultimately convicted of eight murders and one attempted murder.
His case remains especially disturbing because of the combination of a long-running murder spree, the suffering of his victims, the wrongful suspicion directed toward other people, and the extraordinary circumstances that finally led police to his door.
The story of the Ruhr Cannibal is therefore more than simply the story of a serial killer. It is also a chilling example of how an ordinary-looking person can conceal a criminal life for decades—and how difficult it can be for investigators to recognize a pattern when the pieces of a crime are scattered across time and place.





