December 27, 1956 - Juana Barraza Samperio
Her victims were elderly women living alone — a population that investigators initially struggled to connect, and whose vulnerability made the crimes difficult to detect across Mexico City's sprawling jurisdiction. The investigation was further complicated when authorities arrested and misidentified other suspects, allowing the killings to continue. Barraza's conviction covered 16 murders, but official estimates placed the total attributed to her between 42 and 48, with more than 30 cases left unresolved when the investigation was formally closed following her arrest.
From Wikipedia
Juana Dayanara Barraza Samperio (born 27 December 1957) is a Mexican convicted serial killer and former professional wrestler known as "La Mataviejitas" ("The Old Lady Killer"). She was convicted of the murders of 16 elderly women and sentenced to 759 years in prison.
The killings attributed to "La Mataviejitas" have been variously dated: some accounts place the first murders in the late 1990s, while at least one source cites a specific killing on 17 November 2003. Authorities and the press have estimated the total number of victims at between 42 and 48 deaths. After Barraza's arrest, officials officially closed the Mataviejitas investigation despite more than 30 unresolved cases. In 2005, Araceli Vázquez and Mario Tablas were also arrested and were at times identified by police and media as "La Mataviejitas".
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