A shark attacks a woman in the pool at a casino day-club, and Catherine soon suspects it's part of a feud between rival casino owners. Meanwhile, Wendy has some sad news for Hodges.
A well-known Las Vegas philanthropist is brutally slashed in her bed, and the team soon discovers that it is dealing with a killer who knows the secrets of some of the city's most prominent citizens.
Nick accidentally stumbles upon a badly decomposing dead body in the home of a mother with a severe hoarding disorder, but that is only the first of a number of grisly surprises the team finds in the house.
A college student suffers a death at the hands of an animatronic dinosaur from a Las Vegas show, while the death of a man whose daughter and friend disappeared years ago is tied a new lead on the locations of their dead bodies.
A badly shredded body is found in the back of an 18-wheeler, and the shredded remains of a credit card at the scene suggest that the CEO of a shady identity theft company is involved.
The deaths of a rancher and an engineer are tied together by their connections to a tainted water supply and the small-town newspaper reporter trying to expose it.
A prostitute is found dead at the same site where a staged photo of the same dead person was taken and posted on a website days earlier, and Hodges theorizes that the parts on his new motorbike were in a fatal accident.
While the team searches for a killer who is killing his victims with an electric chair, Greg falls for a classic film noir "femme fatale" who may be connected to the case.
The death of a prominent professor in the deaf community is connected to a feud between two deaf graduate students competing over a grant, and the investigation creates tension between Sara and Grissom's mother.
CSI investigates the discovery of a dead body with cremated remains in his mouth, and whose body parts were cut up and placed in thrift store boxes. Meanwhile, Langston's ex-wife comes to him with a surprise announcement.
Dr. Langston confronts Nate Haskell one more time during his murder trial. Meanwhile, Nick faces an old teenage nemesis, Jason McCann, who is seeking revenge for his brother's death.
When two people who were thought to be dead come back to life, the evidence leads CSI back to a discredited ex-professor who conducted bizarre death-related experiments in the 1970s.
After a cop convicted of killing his police officer wife is killed in prison, the team discovers that he may have been framed, and Brass and Vartann may have been romantically linked to his wife.
With a suicide, a homicide, and an accidental death already in the books, the team places bets on whether there will also be a natural causes death to complete "the cycle" before the end of the shift.
Dr. Langston turns to Lady Heather for help in the murder of a woman who acted like a cat, and Nick tries to figure out what caused a pregnant teen to commit suicide after he saves her baby.
While the team discovers body parts of a man and a woman in a barn, a ransom video involving one of Nate Haskell's brides arrives at the crime lab. They soon discover that the two cases are actually connected.
Dr. Langston kills Nate Haskell, but was it murder or self-defense. Meanwhile, a closer look at the crime scene reveals details about Haskell's twisted past and his descent into a serial killer.
