For your information, Birth, Marriage and Death records are from January 1st 1864. All registered birth and marriage records are on computer. The death records are not fully computerised. They may be up to 1877, so it requires a search of the record book for that particular area.
You can contact the Registrar in Roscommon at groireland.ie You can also contact the Health Board Offices in Kilkenny Civil Registration. The telephone number is available on this site. They would have the original records from 1864.
Other records which may be of interest to you Catholic Records @nli.ie and Land Records www.askaboutireland.ie. Free Sites.