May 20, 1930 - Yiya Murano
Operating within her own social circle in Buenos Aires, Murano used poisoned cream puffs to kill acquaintances whose life insurance policies she had forged in her favor — a method that combined domestic familiarity with calculated financial fraud. The crimes went undetected long enough for a pattern to establish itself, and her case became one of Argentina's more closely studied examples of intimate-circle serial killing. She served sixteen years before her age and condition moved her sentence to a care facility.
From Wikipedia
María de las Mercedes Bernardina Bolla Aponte de Murano (20 May 1930 – 26 April 2014), better known as Yiya Murano, and also referred to as The Poisoner of Monserrat was an Argentine serial killer and swindler. Convicted of three murders, she was imprisoned for 16 years before being sent to an elderly care facility to serve out the remainder of her sentence, due to her advanced age.
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