Marguerite G. McCarthy, 81, of Park Ridge, passed away Sunday, May 3, 2026. Born September 22, 1944 in Chicago, she was the daughter of the late Catherine C. (O'Connor) and Maurice J. McCarthy. Loving sister of the late Maurice (Sheila) McCarthy, Maureen (Ken) Rosenston and Marcia (Martin) Mahoney. Aunt of Martin and Michael Mahoney and Moira McCarthy. Great Aunt to Shael McCarthy and Charlotte and Aila Mahoney. Visitation will be Friday at Our Lady of Ransom Church, 8624 West Normal Avenue Niles from 9:00 AM to 10:00 AM followed by Mass at 10:00 AM. Interment  All Saints Cemetery.  After receiving a degree in Chemistry from Loyola University, Marguerite spent many years as a Chemist at Baxtor and Abbot Laboratories.  Broadening her talents with an MBA, Peg began working in business at KFC and then opened a computer store and taught computer science for years before retiring.  Arrangements by Skaja Terrace Funeral Home. Funeral info: 847-966-7302.