Smith plays the extremely popular, acid-tongued Lady Violet, the Dowager Countess of Downton. The show is currently filming its third season and according to the Daily Mail's source, Smith has agreed to do the Season 3 Christmas special, but has asked that Season 3 be her last season.
"She is filming until August and then wants to leave, going out on a high. She thinks that three series is enough and she wants to get back to the stage and big screen," says the source.
Zap2it previously reported that Smith had not yet renewed her contract for Seasons 4 and 5, as many of the main actors have. It was also revealed recently by PBS executive producer Rebecca Eaton that Season 3 will feature a major character death. There