Weston - Mr. Francis C. Frank Thibeault, of Weston, formerly of Waltham, died Thursday, July 19, 2007 at Massachusetts General Hospital, Boston. He was 90. Born in Watertown, a son of the late Charles and Mary (Moore) Thibeault, Frank was a sheet metal model maker for the Raytheon Corporation for thirty-six years until his retirement in 1986. Frank also worked for many years as a shipfitter at the Charlestown Navy Yard. He was also a member of the Waltham Knights of Columbus Council, No.147, past president of Brook School Tenants Association and had been active at Saint Julias Parish in Weston. Frank was the father of the late Paul F. Thibeault and brother of the late Joseph A. Thibeault, Arthur E. Thibeault, and Ann Isaacson. Frank leaves his beloved wife of sixty-five years, Eileen D. (Black) Thibeault and was the devoted father of Diane M. Kotsaftis and her husband, John, of Littleton, Nancy T. Hamby and her husband, Joseph, of Memphis, Tennessee, Susan D. Emmert and her husband, John, of Sagamore Beach, Charles T. Thibeault of Hyde Park, Robert F. Thibeault of Brewster, Richard P. Thibeault and his wife, Lisa, of Springfield, Ohio, David A. Thibeault and his wife, Karen, of Fitchburg and Francis C. Thibeault, Jr. of West Roxbury. He also leaves twelve grandchildren, thirteen great-grandchildren and many nieces and nephews. The Funeral will be held Monday at 9 a.m. from The Joyce Funeral Home, 245 Main Street (Rte.20), Waltham followed by a Funeral Mass in Saint Julias Church, 374 Boston Post Road, Weston Center, at 10 a.m. Burial will be in Calvary Cemetery, Waltham. Visiting hours will be held Sunday from 2 to 5 p.m. Memorial donations may be made to Saint Julias Church.