Greed leads to murder and destroys the lives of five people when two of them discover a stash of old casino chips worth $1,000 each on the collectible market.

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.

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...

Catherine looks into one of her first cases as a CSI when a man claims that the verdict was influenced by faulty forensics.

When the "star" of Astro Quest Redux is found murdered at a science fiction convention, assorted freaks and geeks are obliged to boldly go under the scrutiny of the CSI team.

Nick's case of an injured skydiver takes an interesting turn when Catherine discovers there may be a connection between the skydiver and a mysterious double murder case.

In the 200th episode, one of Ray's former students is murdered, and the investigation plunges the team into the mysterious world of Mexican wrestling.

Langston and Riley are taken hostage during the aftermath of a shootout in an usually calm Las Vegas community.

When the CSIs are called to a murder scene at a familiar motel, Nick is thrown for a loop as he pieces together three separate murder investigations that all took place at the same establishment over the course of a year.

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.

While Langston testifies in the trial of a respected Congressman, new evidence sends the CSIs back to the lab to reopen the investigation.

Langston and Nick are called to investigate a murder at a fast food restaurant and have quite a task ahead of them when they discover that much of the evidence is coated in cooking oil.

The CSIs are called in when an undercover FBI agent is found brutally murdered. The CSIs must help the victim's parter find the killer.

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 homicide and arson case.

The CSI team works to close Grissom's last open case, the "Dick & Jane" murders, as Grissom prepares to leave the team for good. Before leaving, Grissom offers Dr. Raymond Langston, who helped the CSI's with the "Dick & Jane" case, a permanent position as part of the CSI team.

When a new murder leads to a connection with an infamous serial killer, Grissom secretly joins the class of well-known criminal pathologist Dr. Raymond Langston (Fishburne), to gain access to the killer and get a crack in the case.

The CSIs discover a link between the death of a popular young singer and a murder that happened over 50 years ago.

The CSI teams investigates the death of a woman, married to a man who committed murder twelve years ago. In the meantime, the fate of Natalie Davis is being decided...

The CSI team investigates a shooting at a Koreatown neighborhood party, in which the mother and uncle of a small boy, Park Bang, are murdered.

When the CSI team investigates a case involving the world of domination, Grissom pays a visit to Lady Heather to help find some answers.

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.

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 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 murder 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 murdered.

The ninth season comes to a shocking open when CSI Warrick Brown is shot and killed outside a Las Vegas diner. The entire team grieves for their fallen friend, while unknown to them, the killer is one of their own. Also Sara returns to Las Vegas when she hears the news.