Silke Schäfer: The Dark Legacy of Klaus Ziegler

On October 13, 1990, a woman stepped onto the platform at Frankfurt’s main train station, unaware that she’d soon become part of one of Germany’s most disturbing crime sprees. Her disappearance would become the final confirmed act of a serial killer whose crimes haunted the country for nearly a decade.

Silke Schäfer was 25 years old, an aspiring graphic designer, and lived in Wiesbaden. She worked part-time at a bookstore while pursuing her studies. Colleagues described her as meticulous and cheerful, someone who never skipped work without notice. On the evening of October 13, she was on her way home after visiting friends in Frankfurt. She called her roommate to say she’d catch the last S-Bahn train out of the city. That call would be the last anyone heard from her.

Only months before, in June 1990, a Munich-based task force quietly formed in response to a disturbing pattern. Since 1984, at least six women between the ages of 18 and 32 had vanished or been found murdered under similar circumstances along the main railway routes connecting Frankfurt, Wiesbaden, and Mainz. In each case, the victims appeared to have been traveling alone, usually at night, and their bodies were discovered in wooded areas not far from train stations.

The earliest known victim, Inge Weber, was a 21-year-old university student last seen alive on October 23, 1984, waiting on platform 4 at the Wiesbaden Hauptbahnhof. Her body was found six days later in a forest near Niedernhausen, about 15 kilometers from where she was last seen. The cause of death was strangulation. Police found no obvious signs of sexual assault, but Inge’s purse and identification were missing.

Over the following two years, two more women disappeared under nearly identical circumstances: Karin Roth, a 29-year-old office worker, vanished after boarding a late train from Mainz in March 1985; and Gisela Becker, a 23-year-old medical student, disappeared after leaving a lecture at the University of Frankfurt in November 1986. Both were eventually found dead in remote areas on the outskirts of small towns. In each case, the killer used ligature strangulation, and in at least one case, Gisela’s body had been carefully arranged and covered with branches.

As the cases mounted, a troubling pattern emerged. All victims were last seen alone, waiting or boarding late-night trains at larger stations in Hessen and Rheinland-Pfalz. The attacks happened at irregular intervals — sometimes with a gap of more than a year between them — but always along the same regional lines. Investigators believed the perpetrator used the train system to select and follow his victims.

In early 1987, the fourth victim appeared: Petra Lutz, 18 years old, disappeared after leaving a party in Wiesbaden. Her remains were discovered nearly two months later, buried beneath leaves in the Taunus woods. Unlike earlier victims, Petra had been stabbed multiple times before being strangled. This escalation of violence raised urgent questions about the killer’s state of mind.

Detective Inspector Klaus Ritter, an experienced investigator with the Wiesbaden police, was assigned to lead the task force. Ritter’s team combed through hundreds of witness statements, train schedules, and station surveillance logs. They noted that in each case the killer had likely approached his victims at or near a station, sometimes offering assistance or pretending to be a fellow traveler. The lack of clear forensic evidence frustrated the team, as the killer left almost no physical trace behind. Train stations were busy, public spaces, and witnesses rarely remembered faces from late-night crowds.

On May 12, 1988, the killer struck again. Susanne Krüger, age 26, was attacked on her way home from a late shift at a Frankfurt hospital. She boarded a regional train at 11:20 p.m. and was last seen speaking to a man in a dark jacket and cap. Her body was discovered four days later by hikers in the Schwanheim forest. Forensic analysis revealed she had been strangled with a cord, and there were signs of a violent struggle.

It was at this point that Detective Inspector Ritter requested help from the Bundeskriminalamt, Germany’s Federal Criminal Police Office. The BKA dispatched profiler Dr. Jonas Eberhardt, who specialized in behavioral analysis of serial offenses. Eberhardt reviewed all crime scene photos, autopsy reports, and survivor interviews. He concluded that the killer likely possessed above-average intelligence, was familiar with the regional train network, and was methodically stalking his victims. The absence of sexual assault and the care taken to conceal the bodies suggested a complex psychological motive, possibly rooted in resentment or a need for control.

The killer’s most brazen act occurred in January 1989. He targeted a young woman, Sabine Meyer, who survived the attack. Sabine, 20, was returning to her dormitory after a late-night movie in Mainz. She was approached by a man at the station who offered to walk her home, saying he was headed the same way. When they reached a deserted path, he tried to strangle her with a piece of cord. Sabine fought back, scratching his face and kicking him. The attacker fled, leaving behind the cord and a baseball cap. Sabine’s detailed description gave investigators their first real break: she described a man about 40 years old, thin build, with dark, close-cropped hair and a noticeable scar on his left cheek.

Police circulated the composite sketch at all major train stations in Hessen and Rheinland-Pfalz. Over the next six months, several women reported being followed by a man matching the description, but he was never apprehended.

The pattern continued. In April 1990, the body of 24-year-old linguistics student Claudia Berger was discovered in a drainage ditch outside Wiesbaden. The cause of death was again ligature strangulation. Police located a railway ticket in her coat pocket, timestamped for the previous evening, confirming she’d taken the last S-Bahn train from Frankfurt. Three witnesses remembered seeing her speaking with a man at the platform, but could not provide further details.

After the October 1990 disappearance of Silke Schäfer, public fear in the region reached new heights. Newspapers ran headlines about a “Ghost of the Railways.” Local women avoided traveling alone at night. Police increased patrols at major stations, and the BKA established an emergency hotline. However, no new leads emerged.

Then, in December 1990, a breakthrough came from an unexpected place. A railway employee in Mainz recognized the man from police sketches and reported that he’d seen someone matching the description loitering around the station, often late at night. The man was identified as Hans-Dieter Ziegler, a 43-year-old former railway worker who had been dismissed two years earlier for repeated absenteeism and erratic behavior.

Ziegler lived alone in a small apartment near the Mainz Hauptbahnhof. Police placed him under surveillance, observing his nightly routines and monitoring his contacts. On January 17, 1991, they followed Ziegler as he entered Frankfurt’s main station and approached a young woman waiting on the platform. Officers intervened before he could engage her and brought him in for questioning.

During interrogation, Ziegler denied any involvement with the disappearances. Investigators searched his apartment and discovered a collection of women’s purses, scarves, and jewelry, many of which matched items stolen from the murder victims. They also found train schedules annotated with dates corresponding to the nights of several murders. Forensic analysis identified fibers from the victims’ clothing on some of Ziegler’s possessions.

DNA profiling was not widely available or standardized in Germany at the time, so police relied on physical evidence and survivor identification. Sabine Meyer, the attempted strangulation survivor, identified Ziegler in a police lineup as her attacker. Confronted with mounting evidence, Ziegler made several incriminating statements, though he never fully confessed to all murders.

Ziegler was charged with five counts of murder and one count of attempted murder. His trial began in October 1991 at the Wiesbaden District Court. Prosecutors presented evidence linking Ziegler to the victims, including personal possessions, train ticket stubs, and eyewitness testimony. Court-appointed psychiatrists described him as socially isolated, with a personality disorder marked by paranoia and obsessive tendencies. The press dubbed him “Der Schattenmann”—the Shadow Man.

On March 23, 1992, Hans-Dieter Ziegler was convicted on all counts and sentenced to life imprisonment. The judge cited the premeditated, methodical nature of the crimes and the emotional trauma inflicted on the victims’ families. Ziegler showed little emotion as the verdict was read, and he declined the opportunity to address the court.

Despite the conviction, several unresolved questions remained. Some investigators believed Ziegler may have been responsible for additional unsolved murders along the German rail network dating back as far as 1982, but insufficient evidence prevented further charges. To this day, police in Hesse and Rheinland-Pfalz periodically review cold cases for possible links to Ziegler. The full extent of his crimes remains uncertain.

The Ziegler case exposed serious weaknesses in how German police forces shared information about serial offenses across regional boundaries. Before the formation of the task force in 1990, each disappearance was treated as an isolated event, with little coordination between city police departments. The case prompted the establishment of centralized databases for tracking violent crimes and closer cooperation between the BKA and local law enforcement.

Forensic advances since the early 1990s have led to the re-examination of evidence from the Ziegler case. In 2002, partial DNA samples recovered from one victim’s belongings were tested using new technology, but they failed to match any profiles in the European databases at the time. The preservation of key evidence, however, has allowed for the possibility of future breakthroughs if additional victims are identified or new suspects emerge.

The crimes also forced changes in German railway security. Following public outcry, Deutsche Bahn installed emergency call boxes on platforms and expanded station surveillance, particularly at night. Women’s advocacy groups launched campaigns promoting personal safety and lobbied for improved lighting at transit stations.

Hans-Dieter Ziegler was never known to his neighbors as a violent man. Most described him as reclusive, preferring to spend evenings reading train schedules and walking along the tracks. Former colleagues later reported that Ziegler showed an unusual interest in the movements of female passengers and often took unscheduled train rides after his shifts ended.

The prosecution’s case relied heavily on the items recovered from Ziegler’s apartment. Among them was a railway map with small red dots marking the last known locations of each victim. Investigators used this map to identify patterns in his movements and to confirm that he had been present in the vicinity of every crime scene on the relevant nights.

After his conviction, Ziegler was transferred to a high-security prison near Kassel. According to court records, he never admitted guilt, maintaining that he was the victim of a conspiracy. Psychiatrists who examined him during his incarceration described a deep-seated inability to empathize with others and a pathological need for control over his environment.

During the investigation, police discovered that Ziegler had been questioned about the disappearance of a woman in 1983 but was released for lack of evidence. This early missed opportunity became a subject of internal police review.

Court documents show that Ziegler’s methodical approach extended to every aspect of his crimes — he documented train schedules, kept newspaper clippings about disappearances, and altered his appearance between attacks, sometimes shaving his head or growing a beard to evade identification.

Among the more chilling discoveries was a notebook in which Ziegler had written coded entries. When deciphered, these entries corresponded to the dates, locations, and initials of his victims.

The presiding judge at the trial noted that, despite the brutality of the crimes, Ziegler’s lack of remorse set him apart. This observation contributed to the decision to recommend that he never be released, citing the ongoing risk he posed to society.

The Ziegler case stands as one of the most thoroughly documented serial murder investigations in modern German history, with more than 2,400 pages of police reports, forensic analyses, and court transcripts archived by the BKA.