She has been most associated with The Guardian newspaper where she was a foreign correspondent who filed graphic stories from Sarajevo while it was under siege between 1992 and 1996.
O'Kane received her secondary education at Loreto Convent, Balbriggan, County Dublin, Ireland at the College of Commerce (now DIT) where she completed a journalism diploma.
degree in Politics and History at University College Dublin before studying at the Institut des Journalistes en Europe in Paris.
[citation needed] On 15 March 2013, it was reported by the Real News Network that O'Kane had just finished producing a documentary for GuardianFilms on the investigation of the war crimes committed in Iraq on behalf of the Bush administration, focusing on the roles played in the trickle-down military system.
She argues, through her documentary, that the United States army, to quell Sunni rebellion and insurgency, armed and funded national, radical Shia militants to aid them in quelling Sunni insurgency.