Introduced to the CSI unit in season 4, episode 1, as the person who had help pay for the remodel of the CSI building. Specialty is DNA in unsolved cases.When Natalia joined the CSI's, she was an FBI plant (aka mole). She was a better CSI than FBI mole which is why she decided to leave the FBI and join the CSI's. She had a brief relationship with Eric Delko (before it was discovered that she was the mole). When she was a mole, her cover was cold cases; currently, she is a full CSI field agent.