He will be canonized this month and is often associated with liberation theology, but, anyone who has studied his work and life knows this to be a myth. He was a true son of the Church, who studied with the priests of Opus Dei—in itself a disqualifier for belief in liberation theology—and a truly great man.

I highly recommend the movie about him starring Raul Julia, Romero, http://www.amazon.com/Romero-Raul-Julia/dp/B001Q56XOA/ref=sr_1_1?ie=UTF8&qid=1431043382&sr=8-1&keywords=romero+dvd

There is a good article about him in National  Catholic Register.

An excerpt.

Since Archbishop Oscar Romero’s martyrdom in San Salvador’s cathedral while saying Mass in 1980, his legacy as a courageous pastor who gave his life defending the poor and speaking out for peace in his homeland torn apart by fratricidal violence has been obscured by ideology.

As he will be beatified on May 23, certain myths will undoubtedly resurface in both the secular media and some Catholic publications of a particular ideological hue. However, when we analyze Archbishop Romero’s life and teachings, we find that he was an orthodox bishop who rejected violence and Marxism and who used the Gospels and Catholic social teaching, not liberation theology, as his reference points.

Today’s Latin America is nothing like what it was in the 1970s and 1980s. Recently, tens of millions of Latin Americans have been pulled out of poverty thanks to robust economies, with particular progress being made in Chile, Peru, Colombia and Brazil. In the 1970s and 1980s, however, most of the region was ruled by right-wing military dictatorships, and economic inequality plagued the region.

It was in this milieu that liberation theology, a term coined by Dominican friar and theologian Gustavo Gutierrez, developed. Although Gutierrez was not condemned by the Vatican, many liberation theologians he inspired were. In 1984 and 1986, the Congregation for the Doctrine of the Faith — then headed by Cardinal Joseph Ratzinger, later Pope Benedict XVI — published two instructions on the new theology. The documents praised liberation theology’s fight against socioeconomic injustice. They also, however, condemned certain currents of liberation theology for borrowing Marxist methods of analysis, as Marxism is atheistic and denies the human person and man’s right to property; it embraces class struggle, in which individual sin is rejected in favor of class sin; it accepts terrorist violence to overthrow an unjust economic system; it secularizes concern for the poor and replaces theological notions of charity with atheistic class struggle; and it politicizes the Church.

The life and teaching of Archbishop Romero are perfectly in sync with Cardinal Ratzinger’s view of liberation theology. Oscar Romero was born in rural El Salvador in 1917. A gifted student, he studied in Rome, where he was ordained. In 1974, he was appointed bishop of Santiago de María, and three years later, he became archbishop of San Salvador. He quickly became the Salvadoran campesinos’ spokesman.

In his homilies and pastoral letters and on his radio broadcasts, Archbishop Romero condemned the country’s oligarchy (at the time, El Salvador was ruled by “14 families,” a small class of Salvadoran lords who owned virtually all of the land) and violence (Salvadoran peasants at the time rose up against the feudal regime, demanding ownership of their land; the military responded with brutal repression).

Archbishop Romero excommunicated those who killed priests who were defending the peasants. While saying Mass (dramatically appealing to El Salvador’s government to “stop the repression”) on March 24, 1980, Romero was shot.

Retrieved May 7, 2015 from http://www.ncregister.com/daily-news/archbishop-romero-and-liberation-theology/