Óscar Arnulfo Romero y Galdámez (15 August 1917 – 24 March 1980) was a prelate of the Catholic Church in El Salvador. He served as Auxiliary Bishop of the Archdiocese of San Salvador, the Titular Bishop of Tambeae, as Bishop of Santiago de María, and finally as the fourth Archbishop of San Salvador. As archbishop, Romero spoke out against social injustice and violence amid the escalating conflict between the military government and left-wing insurgents that led to the Salvadoran Civil War. In 1980, Romero was fatally shot by an assassin while celebrating Mass. Though no one was ever convicted for the crime, investigations by the UN-created Truth Commission for El Salvador concluded that Major Roberto D'Aubuisson, a death squad leader and later founder of the right-wing Nationalist Republican Alliance (ARENA) political party, had ordered the killing.