Kieran O'Reilly is a real-life police detective who worked for many years as an undercover drugs operative. He is known for his roles in the Emmy award-winning television series, Vikings (2013) and the Irish crime drama, Love/Hate (2010). In 2016 he was nominated for the 'Discovery Award' at the Dublin International Film Festival. He is also the singer/songwriter of the Irish alternative band, Hail The Ghost.