Sameer Syed, who was due to stand trial next week for the murder of his wife Seema Banu and their children, has been found dead in prison.
The death of a prisoner has been confirmed by the Irish Prison Guard to the Irish Mirror.
The man, who was due to stand trial for the death of Seema Banu, 37, Asfira Riza, 11, and Faizan Syed, 6, is understood to have passed away in prison.