Owen Martin and Catherine O'Toole

Looking for death records or burial location for Owen Martin and his wife, Catherine O'Toole.  Lived in Mullaghbawn, Forkhill Parish. Owen was born about 1773 in Mullaghbawn. Their sons, Thomas b abt 1803 and Patrick b abt 1814 immigrated to Ontario, Canada.  Thomas is my g-g-grandfather. Also looking for information on Owen Donnelly b abt 1769, d abt 1843 in Mullaghbawn and his wife, Margaret McMahon b abt 1771 and may have died in Lanark County, Ontario, Canada.  Any information on these would be greatly appreciated.

Audrey L