Catherine Willows (née Flynn) is the night shift supervisor for the Las Vegas Crime Lab. After Gil Grissom left the Lab, Catherine got promoted and became night-shift supervisor. Before her promotion, she worked as the assistant supervisor under Grissom. In 73 Seconds, season 12 premiere, Catherine got demoted to assistant supervisor under D.B. Russell. In Willows In The Wind Catherine resigned from C.S.I and took a job in the F.B.I. She is now the night shift supervisor. She took over for D.B after he left for the cyber team.