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Homicide captain. Brass was the head of the CSI unit in Las Vegas until he was moved back to the police homicide division in the second episode. He was originally from New Jersey. He continues to work with CSI despite problems in season two with his daughter, who is a drug addict and a prostitute in Los Angeles. It was discovered during a near-death experience in season five that he is not Ellie's biological father. He is now captain in the homicide division and works closely with the CSI team. He is very often the one that leads questionings, and his sarcastic attitude makes these questionings darkly humorous, keeping in step with the show's feel.

(wikipedia.org)