CSI: Crime Scene Investigation (season 4) CSI: Crime Scene Investigation (season 4) The fourth season of "" premiered on CBS on September 25, 2003 and ended May 20, 2004. The series stars William Petersen and Marg Helgenberger. Nick accidentally leaks information to a news reporter ("Assume Nothing"), and Catherine tries to discover how a body ended up in a bathtub ("All for Our Country") during the fourth season of "CSI". Supervised by Grissom and Willows, the Las Vegas CSIs are tasked with investigating the bizarre, the unlikely, and the unprecedented, including a disappearing gun ("Homebodies"), the death of a baby during a heatwave ("Feeling the Heat"),
CSI: Crime Scene Investigation (season 6) a suburban home ("Bite Me"), a mass suicide at a cult ("Shooting Stars"), and an apparent suicide ("Secrets and Flies"), as Nick comes to terms with his PTSD ("Bodies in Motion"), and later tracks down a missing child ("Gum Drops"). Also this season, Greg hunts the head of a civil war reenactor ("Way to Go"), Grissom investigates the death of a psychic ("Spellbound"), and Sara comes face to face with her toughest adversary yet ("The Unusual Suspect"). <onlyinclude></onlyinclude> CSI: Crime Scene Investigation (season 6) The sixth season of "" premiered on CBS on September 22, 2005 and ended May 18,