CSI is a crime drama in which the characters use cutting-edge forensic tools to examine the evidence to solve the case. Rather than asking 'whodunnit' (investigating witnesses/suspects), CSI explores the 'howdunnit'.
The CSIs need to ace the case involving a rising tennis star. Meanwhile, the CSIs are surprised to hear Hodges is engaged to an Italian bombshell.
When CSI Mac Taylor decides to surprise his girlfriend in Vegas, he discovers she’s missing and asks his friend D.B. Russell for help.
The CSIs investigate the demise of a famous Cuban singer’s sister who’s in town as part of a U.S. tour. Meanwhile, Hodges begins to get cold feet at the prospect of marrying his Italian bombshell girlfriend.
Sara is a lead suspect in an investigation after a brief encounter with another man in which she was the last person to see him alive. Also, her separation from Grissom begins to take a toll.
When several prominent poker players lose their lives, the CSI team is called to investigate before more victims surface.
At his wife's urging, David reluctantly attends his high school reunion -- which becomes a crime scene when the bitchy former high school queen is found dead in a back room.
When the CSIs find a body near a forest reserve, they discover what might be a serial killer and his bizarre lair.
When the CSIs investigate a triple homicide, Russell has to find a way to connect with a 6-year-old girl who was the sole survivor and witness.
The CSI team investigates a popular spiritual retreat when a body is found floating in a mud bath. Meanwhile, Hodges questions his marriage plans to Elisabetta.
The CSIs investigate the mysterious death of a ghost hunter and experiences déjà vu when the victim has eerie similarities to an old case.
Finlay must deal with a bomb planted in her car. Russell gets a call from someone claiming to be the Gig Harbor killer.
The CSI team investigates a robbery and fatal shooting at a medical marijuana shop.
Sara and Greg are quarantined after responding to a crime scene that’s contaminated with a deadly pathogen.
A chemistry teacher's science experiment goes horribly wrong.
Morgan, Sara and Fin try to relax at a forensics conference when a mass shooting occurs on site.
When evidence indicates that the Gig Harbour killer is responsible for yet another death, members of the team become frustrated.
The team investigates the death of a woman at a rehab facility.
The CSIs delve into the kinky world of 'rubber dolls' when they investigate the murder of a man who was stabbed in an alley.
The CSIs investigate a murder at the Clark County jail after an inmate stumbles upon a body while running away from officers.
The CSI team investigates the bizarre death of a man who was killed not once, but twice.
The CSIs' investigation of the victim of an apparent hit and run leads them into the world of aeronautics.
The CSI team reopens a 10-year-old murder/suicide case when the sole survivor claims her accused father was innocent.
The CSI team investigates a homicide at a convention for people who collect macabre murder memorabilia.
The CSI team investigates the murder of a young victim dressed as a superhero.
The CSI team investigates a death involving a vintage Rolls Royce and a chrome-covered victim.
The CSI team investigates a murder with ties to two teenaged kidnapped girls.
D.B. Russell leads the CSI team on a hunt to find Morgan and Ellie Brass following their kidnapping by a ritualistic killer.
The CSI team is called in to investigate a murder and robbery at a poker game that had more than a million dollars in chips on the table.
The CSI team investigates a fire at a music venue that leaves four people dead, including two band members.
When contestants on a reality cooking show accidentally eat human flesh during a competition, the CSI team is brought in to investigate.
The team meets a blast from the past, with a chance to solve a cold case that has haunted the team for 14 years.
The CSI team investigates the death of a homeless man who had a huge winning streak at a small casino.
The team investigates a John Doe found during torrential rains in Vegas. Meanwhile, Greg Sanders is investigated and accused of framing a man for murder seven years ago.
When a man is found dead inside a human-sized hamster ball, the CSI team is brought in to investigate. Also, the team collaborates with a swing shift CSI on a case involving a serial rapist.
The CSI team is called in to investigate the stabbing of a couple found at a local motel that is reminiscent of two incidents that occurred in the same room.
A spa weekend for Sara, Finlay, and Morgan turns into a murder investigation and missing persons case when Finlay disappears, as the CSI team must piece together what happened in detail to find her.
When a man is found murdered at an elaborate holiday party complete with real snow and live reindeer, the CSI team is brought in to investigate.
An inbound plane’s passengers become the victims of an onboard thief, but when one of the passengers is found dead, the petty crime turns into a murder investigation.
The CSIs are called to investigate a car crash and are shocked to discover the victim is someone they know.
When the CSI team works two separate investigations, one involving a woman found murdered in Mexico and another of a local couple found dead in their driveway, they find the evidence in one case may help the other.
Nick and Greg investigate the death of a 16-year-old girl with ties to a brothel.
When a murder takes place at a chess tournament, the team must rely on a former chess mentor of Sanders' in order to capture "a chess obsessed serial killer" before he can checkmate his next victim.
The CSIs investigate the murder of a rock and roll groupie and the disappearance of a prostitute that both have ties to a mysterious band.
The CSIs are called to investigate when an entire family is reported to have been missing for a month.
Russell is taken hostage after a teen opens fire in a police station.
The team tracks down a cannibalistic killer and discover that he's not the only cannibal involved.
The team investigates the cyber-related murder of a prominent casino owner's wife and receive help from the FBI's Cyber Crime Division.