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Stewart Lee Udall (born January 31, 1920) was an American politician. He served as U.S. Representative from Arizona from 1955 to 1961 and then as Secretary of the Interior under Presidents John F. Kennedy and Lyndon B. Johnson from 1961 to 1969. He was the brother of Congressman and 1976 presidential candidate Mo Udall; his son Tom Udall, and nephew Mark Udall, are currently serving in the U.S. House of Representatives.
| Preceded by: Fred Seaton | United States Secretary of the Interior | Succeeded by: Walter Joseph Hickel |