then given a position as a homicide detective; from then on, Brass serves as the legal muscle for the CSI team and the one who does most of the arresting and interrogating of suspects. Brass later retires from the force to focus on his daughter, and takes a job at Catherine's casino, The Eclipse, as head of security, as seen in "Immortality". Louise Lombard as Sofia Curtis, the LVPD's deputy chief (regular: season 7; recurring: seasons 5–6; guest star: seasons 8, 11) Sofia was a CSI who became assistant supervisor on graveyard, following a demotion from supervisor at the behest of Conrad Ecklie. She later makes a career switch to detective, working alongside Brass, and, rapidly rises through the ranks and becomes the LVPD's deputy chief. She develops a strong friendship with Grissom, much to the chagrin of Sara. Wallace Langham as David Hodges, a trace technician (regular: seasons 8–15, "Immortality"; recurring: seasons 3–7) Hodges is a lab technician with a BA from Williams College; he previously worked in the LAPD crime lab, where his superiors felt he had an attitude problem. Hodges has an uncanny sense of smell, and is able to identify many key chemical compounds by their scent alone. Although shown to be a loner throughout the series, he forms a close bond with Morgan Brody. Lauren Lee Smith as Riley Adams, a CSI level II (regular: season 9 (from episode 3, "Art Imitates Life") Adams is a former St. Louis police officer and a nonconformist who joined law enforcement to rebel against her parents, who are psychiatrists. She fits in well with the team initially, though seems to stop following Grissom's departure. Unhappy with the new leadership of Willows, she departs Las Vegas, leaving a damning exit interview criticizing Catherine's leadership skills. Laurence Fishburne as Dr. Raymond "Ray" Langston, a CSI level II (regular: seasons 9 (from episode 11, "The Grave Shift")–11; guest star: season 9) Langston comes into contact with the CSI team in the course of a murder investigation and joins the Las Vegas Crime Lab as a level I CSI. Working under the leadership of Willows, Langston worries about his genetic makeup and natural predisposition to crime. Langston murders serial killer Nate Haskell during a brutal fight, while rescuing his ex-wife, who had been kidnapped, tortured, and raped by Haskell. Captain Brass is the first police officer at the crime scene. After seeing