Riley Adams is a fictional character in the CBS crime drama CSI: Crime Scene Investigation, portrayed by Lauren Lee Smith. She appeared in 22 episodes during the ninth season, starting with "Art Imitates Life" and ending with "All In".
Adams is described as a non-conformist who joined law enforcement to rebel against her parents, who are psychiatrists. Riley is a former St. Louis police officer who became a crime scene investigator. She comes in as a second-level CSI to the understaffed Las Vegas unit, which is still shaken by the shooting of one of its own.
Riley Adams first came to the Las Vegas Police Department a few weeks after the death of Warrick Brown, a fellow crime scene investigator who had been killed in the line of duty. Her first episode is the third episode of the ninth season, "Art Imitates Life" in which she meets most of the team. She seems to share a friendly, flirting relationship with colleague Greg Sanders. She shares office space with him and Nick Stokes after Nick accepted an offer to have Gil Grissom's old office after his retirement.