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ZDF’s Aktenzeichen XY Reopens Cold Cases and Spurs New Tips

The televised appeals generated immediate viewer leads that police say they are now following up to revive decades‑old investigations.

Overview

  • The ZDF episode on Wednesday reintroduced the 1988 disappearance of Dagmar Knops and prompted the Staatsanwaltschaft Krefeld and Polizei Mönchengladbach to reactivate the case.
  • Authorities have offered a total reward of €10,000 for decisive information in the Knops case and are urgently seeking the group of young people seen on a bench near the pub and the authors of anonymous letters from 2005 and 2008.
  • The six‑year‑old Sven Hollstein’s 1985 disappearance was highlighted under the BKA’s 'Spurlos verschwunden' campaign as investigators asked the public for any recollections that could yield new leads.
  • Investigators also presented an August torso find near Glücksburg and a March 2025 armed robbery in Mühlacker, with forensic traces such as DNA and distinctive packaging under active review but no identifications or arrests so far.
  • Police report strong viewer engagement from the broadcast, say they are following up multiple concrete tips, and warn that televised reopenings can both help investigations and renew emotional strain for families.