Illiterate and introverted, she changed houses several times until 1954 when she began working for Enrique Vilanova and Adela Pascual, a married couple who ran a farmhouse on calle Sagunto in Valencia.
[2] Prades then began work at the home of the military doctor Manuel Berenguer and his wife Mª[note 1] del Carmen Cid, recommended by Aurelia Sanz Hernanz, the cook.
Although the evidence was considered circumstantial, since Prades confessed after 36 hours without eating or sleeping, a flask of an arsenic-based antkiller, thought to be the poison used, was found among her belongings.
In 1985, the first season of the Televisión Española (TVE) anthology series La huella del crimen was produced, one of whose episodes was dedicated to the case of Prades.
José Prades, Pilar's brother, sued TVE and the screenwriter for honour injuries, a lawsuit that was dismissed by the Supreme Court.