One day after making a plea to Salvadoran soldiers to stop carrying out the government's repression, Archbishop Óscar Romero was assassinated while celebrating Mass in San Salvador.

The Revolutionary Government Junta was the name of three consecutive joint civilian-military dictatorships that ruled El Salvador between 15 October 1979 and 2 May 1982.

Óscar Arnulfo Romero y Galdámez 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 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.

The Mass is the central liturgical service of the Eucharist in the Catholic Church, in which bread and wine are consecrated and become the body and blood of Christ. As defined by the Church at the Council of Trent, in the Mass "the same Christ who offered himself once in a bloody manner on the altar of the cross, is present and offered in an unbloody manner". The Church describes the Mass as the "source and summit of the Christian life", and teaches that the Mass is a sacrifice, in which the sacramental bread and wine, through consecration by an ordained priest, become the sacrificial body, blood, soul, and divinity of Christ as the sacrifice on Calvary made truly present once again on the altar. The Catholic Church permits only baptised members in the state of grace to receive Christ in the Eucharist.