Henry I. Ahearn, 100, who retired in 1975 as one of the top civilian administrators with the old Defense Mapping Agency, died Dec. 22 at Avalon House assisted-living facility in McLean. He had complications from hip-replacement surgery.

Mr. Ahearn, a former Bethesda resident, spent 40 years with what was long known as the Army Map Service and then as the Defense Mapping Agency. It is now the National Geospatial-Intelligence Agency.

He began as a draftsman and became a chief executive assistant to top military officials running the agency.

Henry Irving Ahearn was a native Washingtonian and a 1928 graduate of Roosevelt High School.

He was a member of the Knights of Columbus and for many years was head usher at St. Jane Frances de Chantal Catholic Church in Bethesda.

He did volunteer work for Meals on Wheels and played in a duckpin bowling league in Bethesda.

His wife, Doris Kimball Ahearn, whom he married in 1944, died in 2002. Their daughter Laurie Ahearn died in 2000.

Survivors include five children, James Ahearn of Olney, Joni Normyle of Melbourne, Fla., Doug Ahearn of Leonardtown, Mike Ahearn of Damascus and Wendy O’Brien of Reston; a sister; 12 grandchildren; and five great-grandchildren.

— Adam Bernstein