Lester James Hook, 70, a retired executive assistant to the administration who was active in church affairs and charitable organizations, died Friday at the National Naval Medical Center in Bethesda from complications after surgery for an aneurysm.

Mr. Hook began his career with the VA in 1946 as an attorney adviser to the Board of Veterans Appeals. He was associate member of the board for several years before being named executive assistant to the administrator of the VA in 1959. He retired in 1969.

A retired Naval Reserve commander, he saw active duty in the Atlantic and Pacific theaters in World War II. He retired from the Naval Reserve in 1971.

Mr. Hook, who was born in Contoocook, N.H., earned a law degree from Southeastern University here in 1939. He earned a degree in tax law from Natinal University and, in 1965, a master's degree from George Washington University.

He lived in Kensington and was a trustee of Warner Memorial Presbyterian Church there. He was a member of the councils of St. Luke Luthern Church in Silver Spring and St. Paul's Luteran Church in Washington.

He served on the board of trustees of United Community Services and on the Metropolitan Committee for Project HOPE, and was a local volunteer for heart fund and cancer crusade campaigns.

Mr. Hook was a member of the Bethesday Naval Officers Club, the Military Order of World Wars and Columbia Country Club in Chevy Chase. mHis hobbies included golf, world travel, bowling and photography.

Survivors include his wife, the former Inga Rundvold of Kensignton; a daughter, Ingrid Davis of Richmond; two borthers, Maurice, of Venice, Fla., and Kenneth, of Hilton Head, S.C.; and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Lester James Hook Memorial Fund at St. Luke Luthern Church.