Some 49 inquests still haven't been completed.
Some 100 prisoners have died in Irish jails over the past ten and a half years.
While 15 have been confirmed as suicides, while the cause of death hasn't been determined in almost half of the cases.
Last month a man accused of murdering his wife and two children in Dublin in 2020 was found dead in Midlands Prison.
Sameer Syed was due to stand trial the following week in connection with the three deaths in Rathfarnham, It's believed he took his own life.
New figures, released under the Freedom of Information Act, show a total of 100 prisoners have died in Irish jails since 2012.
Of the 100 prisoner deaths in custody since 2012, 49 of the inquests still haven't been completed.
Of those that have, almost a third have been confirmed as suicides.
The Irish Prison Service says all deaths in custody are investigated, including by the Inspector of Prisons and the gardai, where circumstances warrant.
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