Dorothy Ann Diefenbach formerly of the Pennybridge area of Tarrytown, died Sunday, May17, 2015 at the age of 66. Born in North Tarrytown on July 8, 1948, she was the daughter of Anthony and Julia Drahos. She was a graduate of St. Teresa's School and Irvington High School Class of 1966. Dorothy was living in Mardela Springs, MD with her husband Dennis C. Diefenbach who survives her. She is also survived by her daughter Shannon. Also surviving are her brothers Frank Drahos of Tarrytown, Edward Drahos of Wappingers Falls and her sister Judy Gizzi of Chaddsford, PA. A Mass of Christian Burial will be held at Holy Redeemer Church in Delmar at 11:00 AM on Wednesday, May 20, 2015. A graveside service will be on Thursday, May 21, 2015 at Sleepy Hollow Cemetery in New York at 11:00 A.M.