Investigation
The hunt for the perpetrators was led by Superintendent John Mallon, a Catholic who came from Armagh. Mallon had a pretty shrewd idea of who was involved. He suspected a number of former Fenian activists. A large number of suspects were arrested and kept in prison by claiming they were connected with other crimes. By playing off one suspect against another Mallon got several of them to reveal what they knew.
The Invincibles' leader James Carey, Michael Kavanagh and Joe Hanlon agreed to testify against the others. Joe Brady, Michael Fagan, Thomas Caffrey, Dan Curley and Tim Kelly were convicted of the murder and were hanged by William Marwood in Kilmainham Gaol in Dublin between 14 May and 4 June 1883. Others were sentenced to serve long prison terms.
Read more about this topic: Phoenix Park Murders