Dame Diana Rigg, Tony winner for Best Actress in a Play for her last Broadway appearance in Medea in 1994, will return to the West End to join the company of the previously announced production of Pygmalion, beginning performances at the Garrick Theatre May 12, prior to an official opening May 25, for a run through Sept. 3.
SOURCE: Playbill at 10:51AM on March 25, 2011