Mary was born August 14, 1945 in Castlebar, Ireland to Anthony and Rosanne (O’Donnell) Dempsey. She is preceded in death by her parents; sister, Margaret Rose. Survivors include her daughters; Shannon (Tom) Algie, Jennifer (Todd) Marsha; grandchildren, Sydney Eisele, Quinn Eisele and Jack Marsha; siblings, Breda O’Hara, Michael Dempsey, Tony Dempsey, Julie Sheridan, Pat Dempsey, Ann Smith, Neil Dempsey, Thomas Dempsey, and Agnes McDonagh.
