| Season Number: | 7 |
| Bgcolour: |
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| Starring: | William Petersen Marg Helgenberger Gary Dourdan George Eads Jorja Fox Eric Szmanda Robert David Hall Louise Lombard Paul Guilfoyle |
| Num Episodes: | 24 |
| Network: | CBS |
| Episode List: | List of CSI: Crime Scene Investigation episodes |
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 chainsaw massacre ("Toe Tags"), a death at a church ("Double-Cross"), a kidnapping ("Burn Out"), a series of miniature killings ("Post Mortem"), the death of identical twins ("Happenstance"), and the return of a 1970s Mob Boss to Vegas ("Living Legend"). Meanwhile, Catherine faces the loss of her father ("Built to Kill"), Greg is assaulted ("Fannysmackin'"), Keppler faces his past ("Law of Gravity"), and the team attempt to hide their amusement when a man is found trapped in concrete ("Loco Motives").
Louise Lombard joins the main cast, and departs at the season's end.
See main article: List of CSI: Crime Scene Investigation characters.