December 26, 1953 - Margarita Sánchez Gutiérrez
Operating within domestic and social settings where trust was presumed, she used poisoned food and drink to target those close to her — a method that made detection difficult and extended her pattern of harm across multiple victims before suspicion solidified. Four people died; three others survived. Her case stands as an example of how violence concealed within everyday hospitality can evade scrutiny for considerable time.
From Wikipedia
Margarita Sánchez Gutiérrez (born 26 December 1953, in Málaga), also known as the "Black Widow of Barcelona" and "The Black Widow of Hospitalet", is a suspected Spanish serial killer who received her name for her method of murder – by poisoning the food and drinks she offered her victims. She managed to kill four people and poisoned three others who managed to survive. All of the victims were close to her, including family members and neighbours.
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