Waltham - Mr. David L. Thibodeau of Waltham died Wednesday March 8, 2006 at Newton-Wellesley Hospital. He was 43. Born and raised in Waltham, a son of the late Thomas and Anna (Rice) Thibodeau, David was a landscaper in Waltham for many years. He leaves three sons, David Thibodeau, Jr. of Waltham, Scott and Michael Thibodeau both of Rhode Island; four brothers, John Thibodeau of Bourne, Thomas Thibodeau of Waltham, Timothy Thibodeau of Somersworth, New Hampshire and Stephen Thibodeau of Rochester, New Hampshire and several nieces and nephews. Visiting hours will be held Saturday from 2 to 4 p.m. in The Joyce Funeral Home, 245 Main Street (Rte.20), Waltham. Burial will be private. Memorial donations may be made to the American Lung Association, P.O. Box, 265 Burlington, MA 01803.