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Liz Cruz is the head anesthesiologist for what was originally McNamara/Troy. She is often the voice of reason in the office and a strong-willed, empathetic woman. In addition, she is an out lesbian. During many surgeries she criticizes the idea of what type of surgery they are doing, and to whom. At one point she is even questioned by detective Kit McGraw about what it is like for her to be a person with such morals in the business she is in.

(wikipedia.org)