At the request of Bishop
Manuel Larraín Errazuriz,
Pope John XXIII appointed him in 1963 as a bishop assigned as one of the
auxiliaries for the
Talca diocese while making him the Titular Bishop of Columnata. He received his
episcopal consecration at the
Basilica of Lourdes a month after the appointment from
Raúl Silva Henríquez; the
co-consecrators were Manuel Larraín Errazuriz and Eladio Vicuña Aránquiz. He chose as his motto "The Lord sent me to evangelize the poor". He opposed
human rights abuses during the
Pinochet dictatorship and defended the regime's victims all the while braving potential detention and
death threats. In the evening on 11 September 1973 - against the advice of his aides - he went to prisons to inquire about people who were rounded up in a wave of arrests as part of Pinochet's coup against the sitting
President Salvador Allende. There was also one occasion where bombs were placed in his office in a failed attempt to intimidate him into silence. "There are multiple documents, letters, homilies, and reflections found in the Documentation and Archive Center of the Vicariate of Solidarity and that express his particular form of courage and serenity when defending the persecuted." He later became involved with the
Episcopal Conference of Latin America and the Caribbean. He died of lymphoma on 29 April 1982 and his remains were interred in the Marian shrine Nuestra Señora de Lourdes in
Quinta Normal until their transferral on 13 April 2008 to the San Luis Beltrán church.
Pope Francis - during his trip to Chile in 2018 - made an unscheduled visit to the late bishop's tomb for some brief moments of reflection. ==Beatification process==