Waltham Mr. David W. Cosgrove of Waltham died Friday, December 3, 2004 at his home. He was 51. Born in Waltham, a son of Theresa A. (Belliveau) Cosgrove of Waltham and the late William M. Cosgrove, he was a lifelong resident. He was a 1971 graduate of Waltham High School and belonged to the Waltham Elks. David also worked for the Pitney-Bowes Corporation in Waltham. In addition of his mother he leaves his sisters and brothers, Patricia A. Aucoin of Waltham, Margaret M. Cosgrove of Raymond, ME, Jean M. MacKenzie and her husband Martin, Douglas E. Cosgrove all of Waltham, Robert M. Cosgrove and his wife Susana of Auburn and Kenneth P. Cosgrove and his wife Paula of Waltham; and many nieces and nephews. Relatives and friends are invited to attend the Funeral at 8 a.m. Wednesday from The Joyce Funeral Home, 245 Main Street (Rte. 20), Waltham followed by a Funeral Mass in Saint Marys Church, 133 School Street, Waltham at 9 a.m. Burial will be in Mount Feake Cemetery, Waltham. Visiting hours are Tuesday from 4 to 8 p.m.