Retired Navy Capt. Jack Maginnis, 73, a veteran of World War II and the Korean conflict, died Feb. 25 at his home in Alexandria after a heart attack.

A 1927 graduate of the Naval Academy at Annapolis, he served at sea as a gunnery officer, and in 1934 was abroad the restored Revolution-era frigate "Constitution," also known as "Old Ironsides," when it sailed from the West Coast to Boston.

Capt. Maginnis then took postgraduate work at the Naval Academy and received a master's degree in meteorology from California Institute of Technology.

In 1941, he was assistant naval attache at the U.S. Embassy in London and arranged for coordination of meteorological services between British and American forces in the Altantic area.

After serving as secretary to the meteorological committee of the combined chiefs of staff here, he spent the rest of World War II in the Pacific, commanding several ships.

From 1946 to 1949, Capt. Maginnis was director of enlisted performance in the Bureau of Naval Personnel.

In 1950, he commanded a ship in the Inchon invasion during the Korean conflict. He then, returned to the bureau of naval personnel as assistant chief of officer performance.

Capt. Maginnis was commander of Destroyer Squadron 24 and was leading a shelling operation against Communist emplacements near Songjin on Korea's east coast when he was severely wounded in July 1953.

After a year of hospitalization, he went back on duty and commanded the U.S.S. Salem, flagship of the 6th Fleet in the Mediterranean.

He retired from the Navy in 1958, and then become associated with the Alexandria real estate firm of Clarke and Sampson.

Capt. Maginnis's many decortions included the Legion of Merit, the Bronze Str and the Purple Heart.

He is survived by his wife, Grace, of the home in Alexandria, and a brother, Robert, of Livermore, Calif.