Mrs. Doris M. (Marshall) Larson of Lexington died Thursday, August 14, 2003 at Lahey Clinic, Burlington. She was 81. Born in Boston, a daughter of the late Manuel and Rose (Porter) Marshall, she lived for many years in Lexington. She was an active volunteer with the American Red Cross and was past secretary of the PTA of the Harrington School in Lexington. She leaves her husband of 55 years, Clifton C. Larson, one son, James C. Larson and his wife Susan of Hudson; two grandsons, Eric J. and Shaun D. Larson; one brother, John Marshall of Woburn; one sister, Mary Powers of Lynchburg, Virginia and many nieces and nephews. The Funeral will be held at 8 a.m. Monday from The Joyce Funeral Home, 245 Main Street (Rte. 20), Waltham followed by a Funeral Mass in Sacred Heart Church, 21 Follen Road, Lexington at 9 a.m. Burial will be in Westview Cemetery, Lexington. Visiting hours are Sunday 2-5 p.m. Donations in her memory to Boston Catholic Television Center, 55 Chapel Street, Newtonville, MA 02460-9109 would be appreciated.