 Obviously, Oswald was someone the New Orleans field office of the FBI knew well. The agent on duty that night, John Quigley, then asked a young clerk named William Walter, the person who took Martello's call, to check all the files, locked and unlocked, for what they had on Oswald. On one file jacket in the locked filing cabinet of the special agent in charge, where security files were kept, were two names, Lee Oswald and Warren DeBruys.