Who directed an episode that had 2.81 million U.S. viewers?
CREATE TABLE "table1_11111116_7" (
  "no_in_season" real,
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);
SELECT "directed_by" FROM "table1_11111116_7" WHERE "u_s_viewers_million"='2.81';