On August 10, 1991, police officers found the partially naked body of a young woman in a wooded area near the highway in the French city of Besançon. Next to her lay a black tie, which had been used to strangle her. It took seven months to identify the body as that of 17-year-old Bianca Keil from Heidelberg, who had been reported missing. Bianca Keil was originally from Erfurt and had started an apprenticeship as a restaurant manager in a Heidelberg hotel. When 17-year-old Bianca failed to show up for work for several days and no one could reach her, her employer reported her missing on August 14, 1991. Six months passed before the Heidelberg police department received a message from the Besançon police in March 1992 reporting the body of a 17-year-old woman. The French police suspected that it could be the missing Bianca Keil, which turned out to be true. Shortly after Bianca’s disappearance, the Heidelberg criminal investigation department had set up a special commission, as the investigators assumed that Bianca had been the victim of a capital crime. Her 63-year-old great-uncle quickly came under the investigators’ scrutiny, as he had had an intimate relationship with Bianca until shortly before her disappearance, when she ended it because of a young man she had met in Erfurt. However, there was insufficient evidence to conclusively prove that her great-uncle was Bianca’s murderer. Finally, the special commission was disbanded. Twenty years passed before Bianca’s murderer could be convicted. Since the mid-1990s, it had been possible to examine even the smallest traces of skin abrasions for matching DNA. In December 2009, Bianca’s clothing was sent to the Stuttgart State Office of Criminal Investigation for forensic examination for traces of DNA. Three postcards that Bianca’s great-uncle had sent from France to Germany during his bicycle tours served as comparison samples. The same DNA was isolated from the saliva residues under the stamps. Then, in November 2011, the Forensic Institute of the LKA Stuttgart sent a message to the Heidelberg police. It stated that DNA material had been found on the tie used to strangle Bianca, which was 1 in 16 quadrillion times more likely to have come from her great-uncle. At the time, he was a long-distance truck driver who often passed through Besançon on his route from Germany to Spain. In 1991, microfiber traces from Bianca Keil’s last worn clothing had been found on his passenger seat during an examination of the car. It was now clear that Bianca had been strangled by her great-uncle around August 10 with his tie. However, he could no longer be held accountable for his heinous crime, as he had committed suicide in 2000.
The murderer’s tie
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