Passed away peacefully on Friday, June 22, 2018. Predeceased by her beloved parents, Arthur and Mary Stack, and sister, Peggy Stack. She is survived by many cousins. Rosemary spent 22 of her 28 years of government service with the Postal Service, and retired as the executive secretary to the Assistant Postmaster General for International Postal Affairs. She and her sister enjoyed travelling, hosting family gatherings and were active in the Potomac Cairn Terrier Club. Relatives and friends may call at the Church of the Resurrection at Riderwood Village, 3110 Gracefield Road, Silver Spring, MD on Thursday, June 28 beginning at 9 a.m, where the Mass of Christian Burial will be celebrated at 10 a.m. Interment at Fort Lincoln Cemetery. Memorial contributions may be made to the Poor Clares of Perpetual Adoration, 3900 13th Street, NE, Washington, DC 20017.