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As the fourth season begins the team find themselves investigating something that isn't usually on the Statue of Liberty. Can a musician's life be saved before time runs out?
An cold case unsolved for twenty years about the disappearance of a young boy suddenly heats up again when the main suspect in that long ago crime is found dead.
The murder of a man named Luke leads the CSI team into the world of performance enhancement drugs; Lindsay is forced to revisit a hurtful past upon returning to Montana to witness the execution of Daniel Katums.
The CSIs discover the body of a woman dressed in a ballgown after draining a lake in search of a murder weapon. Adam entertains two little girls who are stuck waiting for their mother at the NYPD bullpen with a tale of intrigue.
The CSIs lead an investigation after the body of a masked man found at the bottom of a notorious skyscraper adds to the mysterious count of deaths that form part of the history of the building. Meanwhile, Jo runs into a stranger with an unexpected link to her past while enjoying a day off.moreless
A couple of graffiti artists, who vandalize their district using the tag 'Murderer', will find their sign a very close reality when a body is dumped at their feet.
The CSIs realize that the latest bodies discovered answer to some psychopath reenacting the game of CLUE in real life.
Two men are found dead with a common feature: both have been killed using unconventional methods. Meanwhile, $1 million anonymous checks are left around the city by someone known as the Guardian Angel.
A group of protesters breaks into the NYPD precinct after the police are suspected of killing an unarmed man. Mac and Flack find themselves caught up in the chaos as the team makes a fast move to try and solve the case. On the personal side, Mac contemplates his future with Christine.moreless
Detective Lovato's past as an undercover officer tangles up with her present duty when one of the gang members she ingratiated herself in and developed feelings for turns up tortured and killed.
The team has to try and stop serial arsonist Leonard Brooks after he starts to use fire as a weapon to hurt people from his dark past.
The co-owner of a popular bar is found dead. Meanwhile, Adam is forced to come to terms with his past so he can look ahead.
When evidence surfaces in form of several pictures at a crime scene on the Brooklyn Bridge, the CSIs rush to San Francisco to search for a 16-year-old girl who might be dead already. The case hits home for Jo.
The CSIs with the always difficult task of working a case where an officer has been shot: talking to the family, processing the scene and getting to the bottom of the truth. The case is particularly hard on Lindsay who has strong and fond memories of the victim.
Following the death of a bakery owner, a clown becomes a suspect whose life hangs in the balance because of Det. Flack.
Lindsay becomes injured during the attempted murder of a political candidate. The CSI team race to catch the shooter and the events in the aftermath lead to a child's death.
On the 10th anniversary of 9/11, we bear witness to some specific events from that day as Mac and the team recall some moments that have been indelibly burned in their mind ever since.
The team leads an investigation when a fire chief, a friend of Mac, ends up dead in a blaze that used the same technique as a recently paroled arsonist.
At Valentine's Day the CSIs get a taste of both the sweetest and the sourest that life can offer as they work on three twisted tales of love gone wrong.
The team investigates if the efforts of a young man to get close to a rock star brought about his death.
A witness's death causes Jo to wonder why a rapist was free during her time working at the FBI and, at present, she hopes to be able to put the past behind her.
The team has to figure out if a fraternity prank gone bad led to someone being left for dead in an open grave.
Despite having been stabbed to death in a gruesome way, a young woman seems to have found a last moment of strength to leave a clue pointing to her assassin. The team must determine how much truth there is in the victim's last act.
The team looks into the reason for the assassination of a judge while Jo tries to come to peace with why she left the FBI.
A night out for some drinks among friends will turn out all but a friendly outing when Danny and his rookie cops find themselves caught up in a shooting.
Danny and his team are puzzled as to why young women's bodies are being found in Ferraris and wonder if it'll escalate into something much bigger.
A bike courier, minus his bike, tumbles to his death down the 187th Street Steps and a man out for a jog is found impaled by a hunting arrow against a tree. There is no apparent connection between the two except for an unusual type of chewing gum. Meanwhile Mac and Jo try to get to the bottom of Sid's mysterious absences.moreless
The team has to figure out what would lead a stalker to viciously murder a cage fighter.
The CSIs discover secrets about the lab after seeing connections to a case in the 1950's that may help them figure out why a lab tech was killed.
The team has to figure out what secret a wealthy family is hiding after they are a victim of a home invasion.
A video of a high school party causes the team to wonder if too much weight on a porch caused the death of a girl. Jo has to deal with her former partner bringing memories of her last F.B.I. case.
Mac's team has to figure out if a high stakes tournament lead to murder and hence the CSIs find themselves immersed in the world of competitive video gaming.
A violent shooting leaves Mac in a limbo between life and death and with a choice to make. While he struggles for his life, it's up to his team to bring the shooter to justice.
A fun game gets all too real when one of the players gets murdered by a killer and another player is held for ransom.
Mac and his team try to get to the bottom of the murder of a successful businessman who still felt the pull of his old neighbourhood by going to a Brooklyn housing project and speaking to the victim's old friends and neighbours.
A wave of brutality threatens a small New York City community. As Flack investigates a crime after a body is found dismembered and strategically left out on four street corners he is surprised by an explosion.