in a symbolic statement of his decision to betray House, whom he has come to see as spiraling out of control. In the final days leading up to House's trial, House enters rehab. Tritter confronts him in rehab to see if he was really going through with it. When the charges against House were dropped at the trial, because Cuddy fabricated evidence that acquitted House, Tritter wished House good luck and said that he hoped he was wrong about him. Tritter did not appear on the show again. Amber Volakis Dr. Amber Volakis (Anne Dudek) is an interventional radiologist featured in the fourth and fifth seasons as House's main antagonist. In House's competition to hire a new team, she is #24. Volakis is willing to do anything to get the job, including acts of dishonesty. This is first seen when she apparently quits the competition and convinces a group of applicants to imitate her, rather than be humiliated by House; she returns moments later admitting it was a ruse to thin the herd. She is subsequently referred to as "Cutthroat Bitch" and "Bitch" by House throughout the season, and is even referred to as such on House's caller I.D. After the characters stop using this nickname, she is still almost always called by her first name, unlike the rest of the characters. She sometimes coerces Chase and Cameron, now reassigned to different departments of the hospital, into helping her. Her persistence and unorthodox approaches initially win her praise, but she is ultimately eliminated because House feels she cannot accept being wrong, something he says she would need to be able to accept on a regular basis if she were to work for him. Amber returns in "Frozen", when House discovers that she is Wilson's new girlfriend, a fact Wilson had been trying to conceal from House. House and Amber quickly develop an adversarial relationship, bickering over "shared custody" of Wilson. In the two-part season 4 finale (episodes "House's Head" and "Wilson's Heart"), Amber is involved in a bus crash alongside House, who noticed symptoms of an unknown disease in her immediately before the crash. House later realizes that she is suffering from poisoning from her use of flu pills containing amantadine, along with the kidney failure caused by the crash. She dies in Wilson's arms due to multiple organ failure. Amber is absent from only two episodes in the fourth