Sheahan, Dorothy "Dot" Lee (O'Neill) of Lexington, April 5, 2010. Wife of the late Cornelius T. Sheahan. Mother of Peter H. Sheahan and his wife Linda Jo of Groton, Nancy L. Sheahan of Billerica, and Timothy J. Sheahan of Ayer. Grandmother of Joseph, Daniel, and the late Callie. Dot was a Technical Illustrator at the MIT Radar Lab and later worked at GCA. She devoted her life to her family. Dot loved gardening, swimming, the ocean, and her friends. Calling Hours will be held Thursday April 8 at the Douglass Funeral Home, 51 Worthen Rd. Lexington from 5-8 PM. A Graveside Service will be held Friday April 9 at Westview Cemetery, 520 Bedford St. Lexington at 11AM. Relatives and friends are kindly invited. Donations in her memory may be made to the American Heart Association, 20 Speen St. Framingham, MA 01701.