The Phantom of Heilbronn: How Contaminated DNA Sent The German Police On A Wild Goose Chase

On the afternoon of April 25, 2007, Michele Kiesewetter , a 22-year-old police officer in the German city of Heilbronn, was shot dead in a parking lot. Kiesewetter had been on patrol with her partner, Martin Arnold, when the two officers pulled into the lot around 2 p.m. to have lunch. Shortly afterward, a taxi driver alerted the police to a possible attack. When officers arrived at the scene, they found Kiesewetter hanging upside down from the open driver's side door, with a single gunshot wound to the head. Her partner, Martin, was also shot in the head but was still breathing. He recovered months later, albeit with lifelong disabilities. The crime scene and the patrol car were meticulously examined. Both officers’ service weapons and handcuffs were missing. However, forensic experts recovered a crucial piece of evidence—traces of DNA inside the vehicle that did not belong to either of the victims. A database search revealed that the DNA matched that of an unidentified woman already wanted in connection with more than forty crimes—including homicide, robbery, and kidnapping—committed across Germany, Austria, and possibly France. Police officers attend the funeral procession of Officer Michèle Kiesewetter in April 2007. The unique DNA signature first surfaced in 1993 in Idar-Oberstein, a small town roughly two and a half hours northwest of Heilbronn. There, 62-year-old churchwarden and pensioner Lieselotte Schlenger was found strangled in her rented apartment. The murder weapon was a thin wire used to tie a flower bouquet. No fingerprints were recovered and no witnesses emerged. However, a swab taken from the rim of a teacup on Schlenger’s kitchen table produced a trace amount of genetic material—just enough to be analysed. Eight years later, in March 2001, the DNA turned up again—this time at the scene of another murder in Freiburg.