William J. Hood, a retired senior officer in the Central Intelligence Agency and a writer, died at home in Amagansett early on the morning of Jan. 28. He would have turned 93 on April 19.
During World War II, having just transferred from the Army into military intelligence, Mr. Hood volunteered for the Office of Strategic Services, the predecessor to the C.I.A. He worked for a time on Ultra, a top-secret exploitation of coded German messages that the British and Americans had cracked and that the Germans thought was invulnerable, Enigma.