January 31, 1911 - Władysław Mazurkiewicz
Operating in the unsettled social landscape of postwar Kraków, Mazurkiewicz targeted victims who included a millionaire and his family — killings that point toward predatory opportunism in a city still reconstituting itself after wartime destruction. Convicted on six counts of murder, he was nonetheless suspected by investigators and rumor alike of a far larger body of victims, the true scope of which was never established. The gap between what could be proven and what was alleged has kept his case a subject of ongoing scrutiny in Polish criminal history.
From Wikipedia
Władysław Mazurkiewicz (31 January 1911 – 29 January 1957) was a Polish serial killer from the post–World War II Kraków. He also owned property in Warsaw. His economic standing and polite manners in Stalinist Poland earned him the nickname "The Gentleman Murderer" (elegancki morderca), as well as "Piękny Władek" (the handsome Władek).
Mazurkiewicz was arrested in 1955 and charged by the prosecution with six murders and two more attempted murders. He was convicted of killing four men and two women: Wiktor Zarzecki, Władysław Brylski, Józef Tomaszewski, and millionaire Jerzy de Laveaux along with his wife Jadwiga de Laveaux and her sister, Zofia Suchowa. He was tried by the regional court in Kraków and sentenced to death on 30 August 1956. He was executed by hanging five months later on 29 January 1957, two days before his 46th birthday. According to various rumours, Mazurkiewicz might have been responsible for as many as 30 murders, which were never confirmed.
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