Katarzyna Onyszkiewiczowa

Katarzyna Onyszkiewiczowa (1840 – 9 March 1895), known as the Female Demon among other purported names, was a Polish thief and serial killer who was responsible for at least three murders in Galicia from 1869 to 1870. She was convicted of these deaths in separate trials, and eventually died behind bars while serving one of her sentences.

Biography Much of Onyszkiewiczowa's background is unknown, including her real name. The most popular theory is that she was born circa 1840 to a peasant family living in Chernivtsi (now part of Ukraine), and was raised in the Greek Catholic faith. For her last crimes, Onyszkiewiczowa was sentenced to an additional 10 years' imprisonment to be served concurrently with her previous sentences, and she was remanded to serve them at Lviv Prison, where she died on 9 March 1895.