| Season Number: | 9 |
| Bgcolour: |
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| Starring: | William Petersen Marg Helgenberger Gary Dourdan George Eads Eric Szmanda Robert David Hall Wallace Langham Paul Guilfoyle Lauren Lee Smith Laurence Fishburne |
| Num Episodes: | 24 |
| Network: | CBS |
| Episode List: | List of CSI: Crime Scene Investigation episodes |
The ninth season of premiered on CBS on October 9, 2008, and ended May 14, 2009. The series stars William Petersen, Marg Helgenberger and Laurence Fishburne.
As the team grieve for their fallen colleague ("For Warrick"), Grissom makes a life changing decision ("One to Go"), during the ninth season of CSI. Also this season, Sara investigates the death of a woman attacked nine years ago ("The Happy Place"), new CSI Riley Adams joins the team ("Art Imitates Life"), and she and Nick witness a store robbery on Halloween ("Let it Bleed"), Grissom attends the trial of the Miniature Killer ("Woulda, Shoulda, Coulda"), and an infamous serial murderer brings Dr. Raymond Langston face-to-face with the CSI team ("19 Down"). As Catherine adjusts to life as the team's leader, she investigates the bizarre, the brutal, and the unlikely, including an S&M related murder ("Leave out all the Rest"), an arson-homicide ("The Grave Shift"), the murder of an FBI agent ("Disarmed & Dangerous"), death-by-toothpaste ("Deep Fried & Minty Fresh"), and a Mexican wrestling related death ("Mascara"). Nick, meanwhile, investigates the happenings of a seedy motel over the course of a year ("Turn, Turn, Turn"), and Hodges and Wendy attend a sci-fi convention ("A Space Oddity").
A writer and producer of episode 13 ("Deep Fried and Minty Fresh"), Sarah Goldfinger, was sued for defamation of character by California real estate agents Melinda and Scott Tamkin.
William Petersen and Gary Dourdan both depart the main cast, and are replaced by Lauren Lee Smith and Laurence Fishburne. Jorja Fox guest starred as Sara Sidle in three episodes and appeared in a cameo in one.
See main article: List of CSI: Crime Scene Investigation characters.