CSI: Crime Scene Investigation (season 7) CSI: Crime Scene Investigation (season 7) The seventh season of "" premiered on CBS on September 21, 2006 and ended May 17, 2007. The series stars William Petersen and Marg Helgenberger. Catherine heads to a small town in Nevada ("Leaving Las Vegas") as Grissom and Sara continue their affair ("Living Doll"), in the seventh season of "CSI". Supervised by Grissom and Willows, the Las Vegas Crime Scene Investigators face both personal and professional challenges as Grissom says goodbye, and new CSI Michael Keppler joins the team ("Sweet Jane"), as they investigate the bizarre, the brutal, and the unprecedented, including a
CSI: Crime Scene Investigation (season 8) main cast member in a starring role. Wallace Langham joined the main cast. Only 11 episodes had been completed and aired before the 2007 Writers Guild of America strike. Only six more episodes were made after the strike, for a total of only 17 episodes. Some international broadcasters only showed the first part of the crossover "Who and What" because "Without a Trace" did not air (or aired older seasons) at the time. <onlyinclude></onlyinclude> CSI: Crime Scene Investigation (season 8) The eighth season of "" premiered on CBS on September 27, 2007 and ended May 15, 2008. The season stars