CREATE TABLE table_16458 ("No. in season" FLOAT, "No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

Who directed an episode that had 2.81 million U.S. viewers?
SELECT "Directed by" FROM table_16458 WHERE "U.S. viewers (million)" = '2.81'
SELECT "Directed by" FROM "table_16458" WHERE "U.S. viewers (million)" = '2.81'