He was ordained as a priest on 13 November 1960 and, after studying in Rome for an additional two years, returned to Bogotá where he taught philosophy at the local seminary for four years. In 1968, he organized the new pastoral department of the Archdiocese of Bogotá, and from 1970 to 1972, he was Vicar General of the archdiocese. In early 1971, Pope Paul VI appointed him titular archbishop of Boseta and Auxiliary of Bogotá.
CELAM
In 1972, López Trujillo was elected general secretary of the Latin American Episcopal Conference, a post he held until 1984. Well known for his dislike and distrust of the radical social agenda espoused by many Latin American priests and bishops, in this capacity he led the opposition to liberation theology and succeeded in watering down or reversing many of the reforms made in that forum. He would go with paramilitaries into rural areas and slums, and tell them which priests were involved with social work or believed in liberation theology, which often caused the paramilitaries to murder those priests or force them into hiding or exile One of his major accomplishments during that period was to organize the third general conference of Latin American Bishops in 1979, in which Pope John Paul II participated. That same year, he became Archbishop of Medellín.
Cardinal in Rome
Archbishop López Trujillo was named Cardinal-Priest of Santa Prisca by John Paul II in the consistory of 2 February 1983, becoming the youngest cardinal until 1991. He was promoted to the order of Cardinal Bishops on 17 November 2001. In 1990, López Trujillo was named president of the Pontifical Councilfor the Family. He assumed the office in 1991 but retained the title of Archbishop emeritus of Medellín.
Positions
As president of the Pontifical Council for the Family, López Trujillo was a highly influential proponent of conservative values, particularly on sexual matters and liberation theology. He advocated abstinence as an effective solution in the prevention of HIV/AIDS. He reaffirmed the Church's teaching that the use of condoms is immoral, and sought to discourage condom use among Catholics and in Catholic-run health facilities by stating that they are ineffective in preventing the transmission of HIV – a claim that was opposed and ridiculed by eminent scientists and by the World Health Organization. He was also a strong opponent of gay marriage, abortion and embryological research, warning Catholics involved in the creation of embryos as part of IVF treatment for infertility that they would be excommunicated.
López Trujillo participated in the 2005 Papal conclave, which elected Pope Benedict XVI. López Trujillo was one of the cardinals considered papabile at the 2005 conclave. Upon the death of the pope, all major Vatican officials automatically lost their positions during the sede vacante. Like the others, López Trujillo was reappointed to his previous office by Pope Benedict XVI on 21 April 2005.
Allegations of homosexual promiscuity
An article in The Sydney Morning Herald stated, referring to Frédéric Martel's book In the Closet of the Vatican, "According to the book, a leading figure in this hidden world was Alfonso López Trujillo, a Colombian cardinal who in public was stridently anti-gay and pro-family but in private slept with male prostitutes." A further article in The New York Times reviewing Martel's book suggests Trujillo "prowled the ranks of seminarians and young priests for men to seduce" and "routinely hired male prostitutes, sometimes beating them up after sex".
Death
Following a four-week hospitalization, Cardinal López Trujillo died on 19 April 2008 in Rome, aged 72, due to a respiratory infection. His funeral Mass was held on 23 April 2008 in St. Peter's Basilica. Cardinal Angelo Sodano was principal celebrant of the Mass, and Pope Benedict XVI delivered the homily and performed the final absolution.