Dennis J. O'Callaghan, an American virologist, immunologist and biochemist, died on March 30, 2026. He was born in New Orleans, Louisiana, on July 26, 1940, and earned a B.S. in biology from Loyola University New Orleans in 1962 and a… · 30 March 2026 · March 2026
American activist and politician · 18 June 2025 · O'Callaghan · June 2025 · June 18
Irish IRA commander · 24 August 2017 · August 2017 · O'Callaghan · August 24 · Other
American radio broadcaster · 19 August 2017 · August 2017 · O'Callaghan · August 19
Irish property developer · 24 January 2017 · January 2017 · O'Callaghan · January 24 · Other
Irish Army Lieutenant General · 26 December 2015 · December 2015 · December 26 · O'Callaghan · Other