With an old colleague filling the gap left by Riley's departure, the team investigates odd circumstances surrounding a movie star's fatal car crash.
A pair of murders in a deceptively quiet suburban neighborhood lead to a suspect with a name familiar to the CSI squad — but Ray harbors doubts.
When an IT pro turns up dead in a forest, evidence leads CSI sleuths to a casino security outfit and an office worker with a high-stakes motive.
Investigators suspect racial bias after a patrol officer fatally shoots an off-duty cop, but emerging clues expose a more complicated scenario.
The CSI team works to find connections between the murder of a popular football coach and a decomposed body found trapped in a submerged car.
After a man who's found severely beaten in an alley refuses help, investigators discover his assault might be linked to the death of a local shop owner.
Ray probes a TV weather forecaster's murder and searches for a girl trapped in a human trafficking ring in a crossover with "CSI: Miami" and "CSI: NY."
While the squad looks into a bizarre murder at a bowling alley, Ray reopens a homicide case after a guilty verdict results in the defendant's suicide.
Henry, Greg, Nick and Hodges encounter a strange case during a blighted birthday adventure. The rest of the crew examines a bathtub drowning death.
Investigators find curious connections between an assailant in a gun store shootout and an unknown driver who dumped a dead body from his car.
Catherine unravels the final hours of two friends found murdered in a hotel, while Ray navigates a fresh twist in the Dr. Jekyll serial killings.
The team follows all leads — from players with grudges to estranged family members — after a former golf pro turns up dead at a tournament.
After a high school student's puzzling death and another teen's disappearance, investigators create a data trail to reconstruct the pair's last days.
The CSIs ponder possible sabotage after a musician is electrocuted onstage. Meanwhile, a body found floating in a lake exposes a top-secret history.
Investigators dig deep when the death of a teenager has ties to an old case — and a prison inmate who's appealing his conviction for murder.
In a casino hotel, Catherine and Vartann stake out two drug dealers while Ray and Nick try to get to the bottom of a murder during a lingerie show.
The squad's investigation of a home invasion and murder turns up a new lead on the surgically obsessed serial killer known as Dr. Jekyll.
Nick probes a mysterious outbreak of illness, while Wendy and Hodges lead aspiring CSI students through a fictionalized account of a real case.
Examining the murder of a high school student notorious for his racism, Catherine uncovers a story marked by violence — and possible redemption.
The team looks into a celebrated comedian's death hours before a big comeback show and analyzes a fugitive vigilante's brutal execution by gunfire.
After a car strikes a disoriented woman in the desert, the CSIs take a closer look at the unsolved disappearance of her husband and children.
The Dr. Jekyll investigation takes an unexpected turn when a victim's husband makes accusations against Ray, pushing Catherine into a drastic decision.
CSI plays quid pro quo with a serial killer in a daring bid to find Dr. Jekyll, with agents putting their lives on the line to finally crack the case.
The team gathers evidence left by a bomber who attacked a fallen police officer's funeral, while Ray fights for survival following a violent assault.
A fatal shark attack in a casino pool leads Catherine and the crew to suspect that a long-simmering Las Vegas rivalry is to blame.
Ray and Nick link a gruesome ritualistic beheading during a blood moon to the combative attendees of a convention for vampires and werewolves.
The CSIs hunt a mysterious, leather-clad serial killer nicknamed "Sqweegel" who stalks and attacks victims who refuse to confess their dark secrets.
Responding to a call about a body in the house of a woman with hoarding disorder, the team finds more than one corpse — and more than one suspect.
When the CSI investigators examine the body of a paleontology student, his puzzling wounds indicate a seemingly impossible cause of death.
After piecing together a murder victim whose body was fed into a shredder, the team connects the dead man to an identity theft protection service.
CSI confirms that two mysterious deaths in a small town are linked to the same energy company — one that's under scrutiny by a local reporter.
The CSIs learn that a gambler who plummeted to his death from a casino balcony had just lost a fortune, but evidence points to murder, not suicide.
An obsessed FBI agent points the CSI team to a serial pedophile he believes to be responsible for murdering his wife and kidnapping his daughter.
A staged crime scene photo that later becomes all too real pulls CSI into a case linked to zebra hairs, backstage passes and a grim "bucket list."
Called in to analyze a burned corpse, Ray discovers the victim is still alive with injuries indicating a botched electric chair execution.
A deadly car bombing leads the team to the director of a deaf charity — and to Grissom's mother — in a case that becomes personal for Sara.
The CSIs investigate body parts found at a donation center and learn that they belong to a single father who choked to death on cremated remains.
Nick narrowly avoids an attempt on his life by a teenage bomber CSI has encountered before. Ray testifies against Nate Haskell.
Two instances of the dead coming back to life point the CSIs to a disgraced former researcher whose controversial work seems to have resumed.
CSI examines the murder of a former police officer in prison for killing his wife, a case that Brass and Vartann investigated when it happened.
During a graveyard shift of unusual cases, the CSIs place bets on which investigator will get assigned the evening's first death by natural causes.
Sara and Ray learn the peculiar story behind a woman who was killed by a mountain lion. Nick investigates a teen suicide caused by cyberbullies.
Ray takes the lead when escaped serial killer Nate Haskell resurfaces in videos intended to blackmail the father of one of his "brides."
Haskell kidnaps Ray's ex-wife in Los Angeles, taking their game of cat and mouse to a new level — and spurring Langston to disobey orders.
The long, bloody war between Ray and his archnemesis, Haskell, comes to a violent conclusion that profoundly affects the CSI team.
A shooting on a tram gives the team the chance to meet its unconventional new lab director. A body's strange condition defies easy explanations.
A case involving multiple murders in an ecologically conscious community takes an unusual turn when several suspects offer contradictory confessions.
When Stokes makes a grisly discovery at an art gallery, the CSIs turn to a past case for answers. A body found under an overpass hides a sweet secret.
The city's former mayor becomes a target at the opening night party for the Mob Museum. A discovery at a hotel suite implicates a wealthy prince.
Looking for some excitement, Morgan gets more than she anticipated when she joins a helicopter transport for a man found with many serious injuries.
When the CSIs find the body of a woman pierced with numerous long needles, their search for answers leads them to a carnival sideshow.
The team faces a confounding case when a chaotic multicar crash leaves behind three intact bodies and one additional brain.
The CSIs travel down a road full of twists and turns when they discover that three seemingly unconnected murders all have links to cold cases.
After the team finds evidence of murder but no body at the home of a former military ranger, the FBI becomes part of the hunt for answers.
Doc Robbins gets a shock when his wife calls to report a naked dead man in their bed. She denies any infidelity, but the team finds reasons for doubt.
When Catherine unearths a link between her friend Laura and three skeletons found in a forest, she worries about the threat posed by Laura's husband.
In grave danger and on the run with Russell, Catherine calls on some old friends to help them evade their pursuers and uncover the truth.
The CSIs contend with a worsening threat when a stalker who's been stealthily cutting off women's hair begins murdering his targets, too.
Russell seeks a friend's help when faced with the case of a man found at a car crash with a bullet in his brain — and other people's blood on his shirt.
In her first case with the team, Finlay helps track down an entire house that's inexplicably gone missing. But an unpleasant surprise waits inside.
A thunderstorm leaves much of Nevada without power, forcing the team to rely on more traditional methods to solve a kidnapping.
The CSIs question the circumstances that surround a college student's apparent suicide when they learn of the enemies he made with his gossip vlog.
As the CSIs investigate a violent robbery at a theme wedding, they soon realize the culprits may be committing a series of similar crimes.
The investigators believe they have the suspect trapped when a shooting in a casino prompts a lockdown. But their target proves to be tougher to catch.
When a murderer could go free because of his case's connection to corrupt detective Sam Vega, the CSIs race to prove his role in another crime.
After a bomb turns a high-octane dune buggy race into a complicated crime scene, the team scours the desert to find answers.
When the team investigates the murder of the wife of Sheriff Liston's friend, shocking revelations threaten to tear the department apart.
Russell and the CSI team go on a hunt for a kidnapper. Tension rises between Sara and Nick. Morgan awaits news.
The CSI team discovers eight dead bodies inside their favorite diner, and the investigation takes several turns. Sara confronts a soon-to-be enemy.
Clues are elusive when a runaway girl turns up dead at a desert rave, and her missing friend could hold the key to solving the case.
Sanders struggles with the death of his music journalist friend, who is found stuffed inside a piano.
When a police dog handler is murdered, his K-9 partner is suspected — but Stokes works to prove the dog's innocence.
Russell investigates the death of his son's basketball coach, and uncovers complex personal and professional relationships behind the scenes.
The CSI team is shaken when a reverend is found murdered at the gravesite of their former colleague, Warrick Brown.
Eight bodies are discovered in a mass grave, including one connected to a case Finn investigated in Seattle.
CSI pitches in to assist with several arrests on the Strip. Brass learns some disconcerting information about his daughter.
The CSI team investigates a small plane crash near the Strip. A former love interest of Sara's appears.
A local news anchor is murdered during a live broadcast. Sara worries about the distance between her and Grissom.
A rising tennis star is killed after winning a big match. Hodges reveals surprising information to the team.
Russell helps visiting New York CSI Mac Taylor search for his missing girlfriend. This story concludes with the "CSI: NY" episode "Seth and Apep."
The CSI team investigates the death of a famous Cuban singer's sister. Hodges begins to reconsider his future.
Sara becomes a suspect in a murder after she's the last person to see the man alive, leading to another encounter with Basderic.
Several poker players linked to a cheating scandal at a big tournament end up dead, leading CSI to investigate.
David Phillips finds trouble at his 15-year class reunion when he discovers that the former prom queen has been murdered.
A body discovered near a forest reserve leads CSI to an unusual location that could be a serial killer's lair.
Russell faces a personal and professional challenge when the only witness to a triple homicide is a 6-year-old girl.
The CSI team travels to a spiritual retreat to investigate the discovery of a body floating in a mud bath.
The CSI team investigates the death of a ghost hunter, and Sanders reveals his own connection to the paranormal.
A serial murderer has been staging victims to look like scenes from "The Divine Comedy," and one CSI goes on a dangerous mission to find the killer.
Russell leads the CSI team on a hunt to find two people close to them who have been kidnapped by a sadistic killer.
The CSI team investigates when a man commits a murder and takes off with more than a million dollars from a high-stakes poker game.
The CSI team searches for an arsonist when a fire at a music venue kills four people, including two members of the band that was playing.
Things get ugly on a reality cooking show when a losing contestant is murdered and turned into an ingredient for a challenge.
Willows returns to help the team solve a 14-year-old cold case, prompting everyone to reminisce about their time with CSI.
A homeless man who went on a big winning streak at a casino is found murdered with his briefcase of money emptied out.
CSI tried to identify an injured, but still living, man who's found in a flood channel during a storm. Sanders faces a serious legal issue.
A man who liked being put in confined spaces is found dead in a giant hamster ball. Morgan works on the case of a serial rapist.
The CSI team investigates the stabbing of a couple in the same motel room where two other murders occurred.
Sara, Finn and Morgan go on a spa weekend together, but the relaxing outing soon turns into a missing persons investigation.
CSI investigates when a man in a Santa suit is killed at an elaborate holiday party put on by a local realty company.
Several people on a flight discover that items have been stolen from their carry-on bags, but things get worse when a passenger is found dead.
CSI investigates a major car crash and discovers that the victim is a friend of the department, but things might not be as they seem.
The team looks into two separate murders and realizes that evidence from one case may help in solving the other.
Nick and Greg investigate the death of a 16-year-old girl, which leads them to a brothel and the victim's sister.
The CSI team discovers that the murders of an Elvis impersonator and a bird have a surprising connection.
The death of a groupie and a sex worker with ties to a rock band lead the team to Gene Simmons, who helps unravel the mystery.
When an entire family goes missing for a month, the CSI team hones in on a man who says he was hired to do housework in exchange for a place to stay.
When a teenager opens fire in a police station, Russell is taken as a hostage.
While looking for a cannibalistic killer, the CSI team uncovers a underground community of people who fantasize about eating people — or being eaten.
The CSI team enlists the help of the FBI's Cyber Crime Division when a casino owner's wife is murdered.
CSI connects a present-day crime to a mob heist that took place 25 years ago. Brass deals with another difficult personal situation.
Finn and Russell contend with a serial killer case from their past. Finn has a bomb planted in her car, while Russell gets an unsettling phone call.
CSI's investigation into a kidnapping at a medical cannabis dispensary hits trouble when a potential key witness turns up dead.
Sara and Greg are quarantined when they are potentially exposed to a deadly virus while investigating the origins of the outbreak.
The team investigates the death of a high school chemistry teacher and discovers he was involved in unusual activity outside of work.
While Morgan, Sara and Finn are attempting to have a good time at a forensics conference, a mass shooting forces them into action.
The Gig Harbor Killer returns to the forefront of the team's conscience when another victim is discovered.
A woman at a luxurious rehab facility is found dead in a pool with a high level of drugs and alcohol in her system.
The CSI team is introduced to the world of "rubber dolls" when they investigate the murder of a man in an alley.
An inmate takes guards on a chase in the Clark County jail, leading to the discovery of a body in a laundry room.
After the same man is killed twice, the CSI team's investigation leads them into the world of high-stakes pool.
The CSI team delves into aeronautics when they investigate the death of an apparent hit-and-run victim.
The lone survivor of a 10-year-old murder-suicide claims she has information that proves her father was innocent.
The CSIs are distressed to learn that the lead suspect in the Gig Harbor murders will be released due to lack of evidence.
At a convention for people who collect murder memorabilia, a car that once belonged to a serial killer unexpectedly includes a new dead body.
The CSI team investigates when a young man dressed in a superhero costume ends up dead shortly after intervening to help an assault victim.
A woman found dead and covered in chrome paint leads the CSI team to search for the owners of a classic car.
After two teenage sisters are kidnapped, the CSIs hope they can track down the perpetrator before it's too late.
A final showdown with the Gig Harbor Killer approaches as a new set of victims appear. Stokes makes a major decision that affects the team.