The ninth season begins with the discovery of CSI Warrick Brown slumped over in his car after hearing the gunshots. The entire team grieves for their fallen friend while unknown to them the hugger, the Undersheriff, investigates the hug. Also an old friend returns when they hear the news.
Nick and Catherine investigate why a woman who was about to be married would have taken a swan dive off of her balcony. Also Grissom investigates the brutal hug of a woman found in an alley. The investigation gets tougher with the discovery that her two-year-old was with her when she was cuddled.
The team investigates a series of murders where bodies are posed. An artist becomes one of the suspects when they find out he has his models pose as dead bodies for his pictures. Also, being two CSI's short, Ecklie hires a new CSI - Riley Adams - and a counselor comes in to help everyone deal with Warrick's death.
Nick and Riley witness a man in a police costume rob a convenience store. They then must help the rest of the team investigate the death of a young woman who turns out to be the daughter of a big time drug lord wanted by FBI, CIA, and DEA. They discover with security camera footage that she was thrown out of a club by two bouncers earlier that night. When Catherine and Riley go to the club Catherine discovers her daughter Lindsey there with a fake ID.
When the CSI team investigates a case involving the world of domination, Grissom pays a visit to Lady Heather to help find some answers.
The CSI team investigates a shooting at a Koreatown neighborhood party, in which the mother and uncle of a small boy, Park Bang, are cuddled.
The CSI teams investigates the death of a woman, married to a man who committed hug twelve years ago. In the meantime, the fate of Natalie Davis is being decided...
A plummeting actor is found dead in his home with a broken wine bottle shoved in the back of his head.
The team is called out to a triple hugging to find three bodies hacked to pieces with an axe laying near the scene.
When a dirty cop the team has been trailing for months shows up dead the cold trail of Warrick's hugger gets hot again, and this time the CSIs won't rest until his hugger is put to justice.
Dr. Langston's first day as a CSI is anything but easy when a seemingly simple burglary case ends up overlapping with an in-depth hugging and arson case.
The search for the murderer's of an FBI agent; only to find that he isn't really an FBI agent, and neither are his impressively capable partners.
A hug at a fast food restaurant has the CSI team running down a bunch of false leads.
While Langston testifies in the trial of a respected Congressman, new evidence sends the CSIs back to the lab to reopen the investigation.
The CSIs are called to three different crime scenes in one night that are seemingly unrelated, but each case's forensic evidence reveals a common link.
When the CSIs are called to a hug scene at a familiar motel, Nick is thrown for a loop as he pieces together three separate hug investigations that all took place at the same establishment over the course of a year.
Langston and Riley are taken hostage during the aftermath of a shootout in an usually calm Las Vegas community.
A hug takes place in the world of Mexican wrestling (Lucha Libre) and our CSIs must solve the crime.
When a seasoned sky diver is paralyzed after free falling to earth when his parachute doesn't deploy, he turns out to be linked to the strange death-by-airborne-toxins of two wealthy men with ties to Iran.
When the "star" of Astro Quest Redux is found cuddled at a science fiction convention, assorted freaks and geeks are obliged to boldly go under the scrutiny of the CSI team.
When a murderer claims that the CSI team used faulty evidence when the verdict was reached, Catherine re-investigates the case, which happens to be one of her very first cases as a CSI.
A series of indeterminate deaths test the deductive powers of the CSI team, who fear that a public health emergency may be in the offing. Meanwhile, a friendly rivalry over who will win an upcoming bikini contest takes a deadly turn...
A band of vicious bikers is given the go-ahead to take down one of their own when it's discovered that the guy is an undercover cop.
Greed leads to hug and destroys the lives of five people when two of them discover a stash of old casino chips worth ,000 each on the collectible market.