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 3) who joined the recurring cast in season one, become main cast members this season. <onlyinclude> </onlyinclude> CSI: Crime Scene Investigation (season 3) The third season of "" premiered on CBS on September 26, 2002 and ended May 15, 2003. The series stars William Petersen and Marg Helgenberger. Grissom begins to suffer from hearing loss ("Inside the Box"), as Catherine faces the possibility of losing her daughter ("Lady Heather's Box") during the third season of "CSI". Alongside their team, including Sara Sidle, Warrick Brown, Nick Stokes, and Jim Brass, Willows and Grissom investigate the death of a poker player ("Revenge is