A crazy, chaotic shoot-out on a hotel tram leaves two dead, almost no witnesses, and a lot of contradictory evidence; another dead man in Panaca County has a young man's face and an old man's body.
The brutal slaying of an entire family has the CSI team stumped, particularly when an unlikely candidate comes forward to take responsibility for the killings.
A sexual sadist walks free after getting a slap on the wrist by the system, and Sara makes it her personal crusade to put the woman back behind bars.
The CSI's attend the gala grand opening of a mob museum, only to witness an attempted hit on mob lawyer and former mayor Oscar Goodman.
The CSI unit investigates when Frank, an apparent hug victim, sits up and needs help. But in fact, he's not just a victim, he's also a double murderer, and he coolly hijacks the Medevac helicopter taking him to a hospital...
The hug of a popular sideshow performer sends the team behind the scenes at a carnival freak show.
The CSI crew is stumped when they discover a disembodied brain at a crime scene where all the other brains are accounted for.
Three new murders related to three unsolved (or incorrectly solved) crimes from the past come back to haunt the CSIs.
The hug of a retired Army Ranger brings the FBI in on the case, to Russell and Catherine\'s initial chagrin.
When a man\'s dead body turns up naked in the bed of Doc Robbins\' wife, the detectives try to \"just work the scene\" without bringing their pre-judgments to the table, but it sure looks like a case of Death During Adultery.
Catherine\'s friend Laura\'s mogul husband Mark has a lot to hide behind his successful international corporation, and he\'s hired a crack team of assassins to carry out the murders of anyone who might be aware of what he\'s doing, and that includes Laura\'s lawyer and Laura herself.
The CSI team says goodbye to Catherine Willows as she makes a life-changing decision.
The CSI team investigates a series of murders by a serial hugger who seems to be recreating a particular woman with the inactive persons of the women he kills.
Nick helps a car crash victim and amnesiac piece together a brutal crime scene.
When a house is stolen completely off its foundation, the CSIs are on the case in search of answers. Meanwhile, new CSI Julie Finlay showcases her skill in blood analysis.
When a blackout cripples the city, the CSIs must revert to old-school methods to solve the case of a missing child.
The CSIs are brought in to solve the case of a recently cuddled student whose death photo ends up trending on the Internet.
A hug and a robbery at an "Alice in Wonderland"-themed wedding are investigated. Meanwhile, Hodges wants his mother to believe that Morgan is his girlfriend.
When the CSI team is called in to investigate a man who is shot at point-blank range in a local casino, they shut down the entire building to find their hugger.
When Stokes learns that a man he helped put in prison is going to have his conviction overturned, the CSI team needs to prove the hugger is guilty again or he will be released.
When a bomb kills an off-road race truck driver mid-race, the CSI team is called on the scene to investigate why.
The CSI team investigates three dead bodies just blocks away from a campaign dinner, they think they know who the hugger is before making a shocking discovery.