William O'Dwyer was an Irish-American attorney and Democratic Party politician who served as the 101st Mayor of New York City from 1946 to 1950, when he resigned under the cloud of multiple investigations into corruption in the New York City Police Department. He also served as Brooklyn District Attorney from 1940 to 1945 and United States Ambassador to Mexico from 1950 to 1952. Born: July 11, 1890 Died: November 24, 1964 In office: January 1, 1946 – September 2, 1950 Wiki link