Francis H. (Tommy) Thompson, 70, a part-time security guard at the Health, Education and Welfare building in Rockville and a retired C&P Telephone Co. employe, died Wednesday at Suburban Hospital in Bethesda following a heart attack.

Mr. Thompson retired from C&P Telephone of Washington in 1972, after 48 years as an installer and repairman. After his retirement, he joined the Halifax Security Agency and was assigned to the HEW building in Rockville.

He was a member of the Alexander Graham Bell chapter of the Telephone Pioneers of America, the Lutheran Church of St. Andrew in Silver Spring, and a past master of the Masonic National Lodge No. 13. Mr. Thompson also was active in the Boy Scouts in Montgomery County.

Survivors include his wife, Evelyn W., of the home in Rockville; Four sons, Martin W., of the home, Kenneth P., of Tinker Air Force Base in Oklahoma, Daniel A., of Temple Hills, and Francis H. Jr., of Oxon Hill; Four brothers, Lawrence, and Daniel, both of Thousand Oakes, Calif., Theodore, of Columbia, Md., and Donald, of Indian Head, Md., and a sister, Helen T. Moore, of Quinque, Va.

The family suggests that expressions of sympathy be in the form of contributions to the Memorial Fund at the Lutheran Church of St. Andrew in Silver Spring.