Miguel Ángel Prieto lived in Villaluenga de la Sagra, a small town in Toledo, with his wife and two daughters, aged two years and three months respectively. Each day he travelled by car with his sister to Villaverde station. There they parted ways and he took the train to Chamartín, where he worked as a telecommunications engineer. On 11 March 2004, however, he was traveling alone. He was killed in the explosions at Santa Eugenia station.
11 March 2004 fell on a Thursday. Early that morning, a number of terrorists with links to Al-Qaeda planted thirteen bombs on four suburban trains covering routes running through Madrid. Ten of the bombs exploded between 7.37 and 7.39 am, when the trains were at Atocha, El Pozo and Santa Eugenia stations and alongside Calle Téllez. 191 people were killed in the attack and around 1,500 were wounded. It was the deadliest terrorist attack in Spanish history. On 3 April 2004, agents from the Special Operations Group (GEO) were about to enter an apartment in Leganés where the perpetrators of the attacks were believed to be hiding when the terrorists detonated twenty kilograms of explosives in an act of collective suicide. The ensuing blast killed one of the officers, bringing the total number of people killed by the 11 March bombers to 192.