The April 30 episode of CSI: Crime Scene Investigation is a backdoor pilot, featuring Patricia Arquette as new character Avery Ryan, Special Agent in Charge at the Cyber Crime Division of the FBI in Quantico, VA. The new CSI spin-off, if greenlit as a series, will focus on Arquette's character and her focus on crimes that start in the mind, live online and play out in the real world.
Also, one of the series' original cast members, Paul Guilfoyle, is leaving the series. Guilfoyle played LVPD Captain Jim Brass for 14 seasons; his last episode will be this season's finale, which will air on May 7.