When DNA leads the way: The introduction of Forensic Investigative Genetic Genealogy in Sweden and its first use in Europe

This paper details the first successful use of Forensic Investigative Genetic Genealogy (FIGG) in Europe, which was applied to identify a double murder perpetrator in a 16-year-old unsolved case. By integrating advanced SNP typing with genetic genealogy methods, conclusive leads were generated beyond the reach of conventional forensic approaches. By using this case as an illustrative example, we describe how FIGG can expand the forensic toolkit, reshape investigative as well as forensic strategies, and enable resolution in long-standing unsolved cases. We also reflect on how this case highlights the need to balance technical progress in forensic genetics with legal, social, and ethical aspects. Finally, we outline the journey initiated with this successful pilot case to the structured implementation of FIGG as an operational tool within the Swedish Law Enforcement.