Margarita Sánchez Gutiérrez (born December 26, 1953 in Málaga), also known as the "Black Widow of Barcelona" and "The Black Widow of Hospitalet", was a 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.