FitzGerald was conveyed to New Prison, Dublin where he was denied proper medical treatment. After a brief detention in Dublin Castle he was taken to Newgate Prison, Dublin where his wound, which had become infected, became mortally inflamed. His wife, whom the government probably had enough evidence to convict of treason, had fled the country, never to see her husband again, but Lord Edward's brother Henry and his aunt Lady Louisa Conolly were allowed to see him in his last moments. Lord Edward died at the age of 34 on 4 June 1798 as the rebellion raged outside. He was buried the next day in the cemetery of St Werburgh's Church, Dublin. An Act of Attainder confiscating his property was passed as 38 Geo. 3 c. 77, but was eventually repealed in 1819.