Catherine Mildred (Harris) Reardon passed away peacefully Wednesday, October 17, 2012 at the Life Care Center of Merrimack Valley in Billerica at the age of 98. She was the beloved wife of the late John J. Reardon. Born in Lowell on September 22, 1914, "Kay" was the daughter of the late James and Margaret (O'Donnell) Harris and sister of the late Charles Harris. She received her early education in Lawrence and was graduated from East Boston High School in 1932. Kay was the loving mother of C. Ronald Reardon of Coral Springs, FL and the late John Kenneth Reardon of Billerica. Her most cherished memories were time spent with family, caring for and playing with her grandchildren and great-grandchildren, and traveling to Boston by train every week to shop and meet her dear friend, Helen, for lunch. She was a communicant of St. Theresa of Lisieux Parish in Billerica. Catherine is also survived by her daughters-in-law, Isabelle (Shayne) Reardon of Billerica and Michelle (Turner) Reardon of Coral Springs, FL. "Grandmother" will be deeply missed by her four grandsons: Sean and his wife Vikki of Pepperell; Danny and his wife Joan of Billerica; Christopher and his wife Cindie of Groton; and Ryan of Coral Springs, FL. She also leaves 7 great-grandchildren: Daniel, Amanda, Kylie, Colby, Holly, Christian, and Jake Reardon. The family would like to extend their sincere thanks to the staff of the Life Care Center of Merrimack Valley for their many kindnesses and personal care given to our lovely lady.