However, before her audition, Singer had watched some of her performances, including on Dawson's Creek, and already wanted to cast her in the role. Morrison left the show when her character was written out in the middle of season six. At the end of season three, House dismisses Chase, while Foreman and Cameron resign. After an episode in which he "borrows" a janitor whom he calls "Dr. Buffer" to assist in a diagnosis, House must then recruit a new diagnostic team, for which he identifies seven finalists. The producers originally planned to recruit two new full-time actors, with Foreman, who returns in season four's fifth episode, bringing the team back up to three members; ultimately, the decision was made to add three new regular cast members. (Along with Epps, actors Morrison and Spencer remained in the cast, as their characters moved on to new assignments.) During production, the show's writers dismissed a single candidate per episode; as a result, said Jacobs, neither the producers nor the cast knew who was going to be hired until the last minute. In the season's ninth episode, House's new team is revealed: Foreman is joined by doctors Lawrence Kutner (Kal Penn), Chris Taub (Peter Jacobson), and Remy "Thirteen" Hadley (Olivia Wilde). The candidates rejected by House did not return to the show, with the exception of the last one cut: Amber "Cutthroat Bitch" Volakis (Anne Dudek), who appeared for the rest of season four as Wilson's girlfriend, and in seasons five and eight as a hallucination of House's. While Penn and Wilde had higher profiles than the actors who played the other finalists, Jacobs said they went through an identical audition process and stayed with the show based on the writers' interest in their characters. Kutner was written out of the series in episode 20 of season 5 after Penn took a position in the Obama White House Office of Public Engagement and Intergovernmental Affairs. The contracts of Edelstein, Epps, and Leonard expired at the end of season seven. As a cost-cutting measure, the three actors were asked to accept reduced salaries. Epps and Leonard came to terms with the producers, but Edelstein did not, and in May 2011, it was announced that she would not be returning for the show's eighth season. Filming style and locations House is often filmed using the "walk and talk" filming technique, popularized on television by series such