ISABELLE, David J. Of Bedford, Feb. 13, 2013, age 65. Husband of Christine C. Isabelle (Collicut), for 44 years. Father of Nicole A. Isabelle and grandfather of her son Logan, both of Bedford, and father of David J. Isabelle Jr. and his wife Mindy and grandfather of their children Cameron and Piper, all of Tewksbury. Son of Ethel Isabelle, and the late Roland Isabelle. Brother of Steven Isabelle of NC and Deborah Isabelle of Billerica. He is also survived by a niece, Tracy. Retired member of Pipefitters Local Union 537 for 46 years. A funeral service will be held Tuesday Feb. 19 at the Douglass Funeral Home, 51 Worthen Rd. Lexington at 10am. Relatives and friends are kindly invited to attend. Visiting hours Monday from 3pm to 7pm. Donations in David's memory may be made to the Pipefitters 537 Charitable Fund, 35 Travis St. Allston, MA 02134. Interment Westview Cemetery, Lexington