San Patricio in Belgrano is a parish of the Pallottines, an order that came to Argentina from Ireland to serve Irish immigrants. In the early hours of Sunday 4 July 1976, under the dictatorship, the priests Alfredo Leaden, Alfredo Kelly and Pedro Dufau and the seminarians Salvador Barbeito and Emilio Barletti were killed in the parish house. Kelly, the parish priest, and Leaden were of Irish descent, the Irish Times reported in 2008. Pope Paul VI sent a letter of protest.
The case is unsolved. No one has been convicted as of June 2026. A 2006 charge against members of a naval task group was found unproven on appeal, and the investigation was reopened in 2013. Since 2022 a federal judge has examined a different line of inquiry, and in June 2026 four former police officers were summoned for questioning, Tiempo Argentino reported. Cardinal Bergoglio said the 25th-anniversary Mass in 2001 and authorised a canonisation cause; sources give its opening as 2001, 2005 or 2006.
The parish holds a memorial Mass each 4 July. In 2016 the community walked for the first time from the Espacio Patrick Rice at the former ESMA to the parish. On the 50th anniversary, 4 July 2026, Archbishop Jorge García Cuerva said Mass here, and a memorial exhibition opened at the city legislature. In April 2024 the Pallottines gave Pope Francis a painting of the killings.