James Robert `` Jim '' Leavelle ( born August 23 , 1920 ) is the former Dallas , Texas , homicide detective who was escorting Lee Harvey Oswald through the basement of Dallas Police headquarters when Oswald was shot by Jack Ruby .
James Robert `` Jim '' Leavelle ( born August 23 , 1920 ) is the former Dallas , Texas homicide detective who was escorting Lee Harvey Oswald through the basement of Dallas Police headquarters when Oswald was shot by Jack Ruby .