
Sixteen-year-old Lucie Trezzini disappeared after leaving her workplace in the canton of Aargau. Investigators traced her movements to a man she had met near a railway station. Her body was later found in his apartment.
The suspect was arrested after police connected witness information and transport records to the meeting. Forensic evidence established that Lucie had been killed in the apartment. The crime prompted national discussion about supervision after the offender's earlier violent conviction.
Daniel H. confessed and was convicted of murder and related offenses. A Swiss court imposed life imprisonment and indefinite detention, legally resolving the case.