Mark F. Cahill, of Natick, May 3, 2017. Beloved son of the late Dr. Frank and Mrs. Luise (Caggiano) Cahill. Loving brother to Luisa Cahill Dittrich and her husband Alan, of Wellesley. Uncle to Justin Cahill Dittrich of Santa Monica, CA. Also survived by many dear friends, especially John Fitzgerald and Peggy St. Clair of Wellesley. An Army National Guard veteran, Mark had a richly varied career in public utilities, fitness, and finance. He was a lifelong reader of history and the Roman classics, and enjoyed tennis and golf. A private memorial service will be held at a later date. Donations can be made to the Visiting Nurse Association of Natick.