Cover photo for Nancy D. Killen's Obituary
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1939 Nancy 2022

Nancy D. Killen

November 15, 1939 — December 20, 2022

Nancy D. Killen, 83, of Riverhead, Beloved wife of William A. Killen for nearly forty years, devoted mother to John Bailey of Twin Lakes, WI and Steven Bailey of Toronto, Ontario CA, step mother to James Killen and David Killen passed away on December 20, 2022.


Born in Alton, Illinois to Richard and Marguerite Duff, she grew up in Streator, Illinois and Toledo, Ohio. After graduation from DeVilbiss High School in Toledo she attended Northwestern University, earning a bachelor’s degree in mathematics. She then attended The University of Chicago, earning a master’s degree in Statistics.


Nancy Joined Caywood Schiller Associates which was later acquired by A. T. Kearney Management Consultants in Chicago where she advanced to leadership of its logistics modeling and strategy practice. She subsequently joined KPMG and ultimately formed her own firm, becoming President of Bailey Killen Associates. During a long career she worked with major clients including Berkshire Hathaway, Exxon Mobil, M&M Mars, the United States Department of Defense and ConAgra. She was a leader in a profession in which women were rare participants during the 60’s and 70’s.


Nancy moved to Long Island in 1985, living in Port Washington, Huntington, Cutchogue and Riverhead. She loved the North Fork, the New York theater, as a patron of The Roundabout Theater Company and City Center Encores, and her dog Dixie. In retirement she and Bill traveled extensively, often by train to placate Bill. She bravely confronted several medical challenges in her last years. She is deeply missed by her husband, family and friends.


A service and inurnment is planned for a future date in the spring at Calverton National cemetery. Funeral arrangements entrusted to Tuthill-Mangano funeral home, 406 East Main St, Riverhead NY 11901.


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