Leo Egidius Schiffer (1956 – 21/22 July 2018) was a German serial killer who was known as The Strangler of Aachen. Between 1983 and 1990, he murdered five girls and women between the ages of 15 to 31, abusing three of them sexually. His crimes were known as "hitchhiker killings" or "Disco-murders". In 1985, the program Aktenzeichen XY… ungelöst covered his case.