Waltham Miss Margaret L. Gallagher, of Waltham, died Sunday, July 22, 2007 in her home. She was 80. Margaret was born July 27, 1926 in Boston, a daughter of the late John P. and Mary (Clasby) Gallagher. She had been a lifelong Waltham resident. Margaret worked for the Raytheon Corporation for over 50 years, retiring in 1992. She was a member of Our Lady Comforter of the Afflicted Church and the North Waltham and Southside Senior Citizen Clubs. She is survived by her sister, Mary C. Joyce of Onset; many nieces and nephews; grandnieces and grandnephews. She was predeceased by her brother, John P. Gallagher and her sister, Catherine E. OReilly. A Funeral Mass will be celebrated at 11 a.m. Wednesday in Our Lady Comforter of the Afflicted Church, 880 Trapelo Road, Waltham. Burial will be in Calvary Cemetery, Waltham. Visiting hours are omitted. Memorial donations may be made to Our Ladys School, 920 Trapelo Road, Waltham, MA 02452 or to Partners Hospice, 281 Winter St., Suite 200, Waltham 02451.