Siobhan Finneran: I was maid to play TV baddie DOWNTON Abbey star Siobhan Finneran says she gets a kick out of playing the most hated character in the period drama. (After Vera Bates). "OBrien" the lady's maid looks soooo different.
Get ready to say goodbye to yet another Downton Abbey regular. TV Line reports that actress Siobhan Finneran -- a. Sarah O'Brien, Lady Grantham's maid -- is leaving the acclaimed PBS series after three seasons.
Life after O'Brien: Downton's meanest maid reveals why she's quit the Abbey... and gone blonde