November 27, 1974 - Kanae Kijima
Operating through Japan's marriage-hunting websites in the late 2000s, she cultivated relationships with men seeking spouses and systematically defrauded them before poisoning them with carbon monoxide. Convicted of three murders and suspected in four additional deaths, her case drew unusual public attention in Japan — partly for its calculated methodology and partly for the courtroom scrutiny of how an unconventionally presented woman had secured such trust from her victims. The trial prompted broader discussion about vulnerability in online matrimonial spaces and the particular effectiveness of social performance as a means of deception.
From Wikipedia
Kanae Kijima (木嶋 佳苗, Kijima Kanae; born November 27, 1974), known as The Konkatsu Killer, is a Japanese fraudster and serial killer, convicted for poisoning three would-be husbands and suspected of four more, spanning from 2007 to 2009.
She was given her nickname for her frequenting of "konkatsu" (marriage-hunting) websites, with her case also being called with similar names (ex. Konkatsu Killings Case, etc.).
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