Helen Johnson Rearick, 58, a retired administrative assistant in the Department of the Army's office of legislative affairs, died of cancer Thursday at the Walter Reed Army Medical center.

Mrs. Rearick joined the old Office of Emergency Management's office of civilian defense in 1941. In 1942, she transfered to the OEM's War Relocation Authority and War Shipping Administration in San Francisco.

She subsequently worked for the old U.S. Maritime Commission in Washington, the Fifth Naval District in Norfolk, Va., and the Long Beach Naval Shipyard in California.

After returning to this area in 1956, Mrs. Rearick worked for a short time for the Central Intelligence Agency before joining the Army Department's office of legislative affairs. She was an administrative assistant to seven chiefs of legislative liaison before retiring in 1972.

Mrs. Rearick was born in Fairfield, Ill. She and her husband, Kenneth J. Rearick, a retired Navy lieutenant, lived in Arlington for more than 16 years before moving to Melbourne, Fla., in 1972. She was a charter member of the Mount Vernon District Lioness club in Alexandria.

Besides her husband, of the home, survivors include two sisters, Ruby I. Johnson, of Arlington, and Ruth A. Kelly, of Alexandria, and a brother, Charles M. Johnson, of Portland, Ore.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.