ZDF Program Aktenzeichen XY Features Long-Standing Missing Persons and Cold Cases

The German television program "Aktenzeichen XY ... ungelöst" continues its decades-long mission to help law enforcement solve difficult crimes by turning to the viewing public for crucial leads. First broadcast in October 1967 by the public broadcaster ZDF, the show features unsolved criminal cases, ranging from homicides and robberies to long-term missing persons investigations. Led by host Rudi Cerne since 2002, the format relies on dramatized reconstructions, police briefings, and direct appeals for information.

Among the cold cases receiving renewed attention is the 1988 disappearance of 22-year-old student Dagmar Knops in Kempen, Germany. Knops vanished late at night on March 28 after leaving a local pub to walk the short distance to her parents' home. Investigators believe she became the victim of a homicide, although her body has never been found. Police are seeking information regarding a group of young people near the pub that night, as well as the authors of anonymous letters sent in 2005 and 2008 that claimed to know the location of her remains. A reward totaling 10,000 euros has been offered for information leading to the apprehension of a suspect.

Another decades-old mystery featured on the program is the 1985 disappearance of six-year-old Sven Hollstein in Ludwigshafen. Hollstein vanished without a trace on the afternoon of April 15, 1985, near his apartment building. Despite a massive police search and a previous criminal trial that ended in an acquittal, the fate of the boy remains unknown after more than four decades. Authorities hope the broadcast will jog memories or reach individuals who may have observed something significant at the time.

In addition to historical cold cases, the program addresses more recent disappearances. The ongoing search for 60-year-old Larisa Bender from Wehringen, who disappeared on October 3, 2025, is also being highlighted. Despite extensive searches by police, family members, private investigators, and canine units through local forests and rivers, no trace of Bender has been found.

Statistical data from ZDF highlights the effectiveness of the broadcast format in generating breakthroughs. Since the show's inception, nearly 40 percent of the more than 5,000 cases presented have been successfully solved. Because law enforcement agencies often bring cases to the program only after exhausting all traditional investigative avenues, television viewers play a vital role in providing the final pieces of the puzzle.

The show maintains a regular broadcast schedule on Wednesdays at 20:15 on ZDF, with streaming options available via online media libraries. Alongside standard episodes, the broadcaster has expanded the format with specialized segments and digital updates, including dedicated online follow-ups that provide additional information and track the status of ongoing police investigations following each live broadcast.