Obituaries William “Billy” O’ Donnell. By Trudy Waters - 15th May 2017 Share on Facebook Tweet on Twitter Market St., Cahir. Reposing at Costigans Funeral Home Cahir this Monday evening from 5.30with removal at 7.30 to St. Mary’s Church, Cahir arriving at 8. Funeral mass on Tuesday at 11 o’clock with burial afterwards in the adjoining cemetery.