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
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.
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 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
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.moreless
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.moreless
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.
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 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.moreless
The CSIs realize that the latest bodies discovered answer to some psychopath reenacting the game of CLUE in real life.
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.moreless
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.
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.
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.moreless
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 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.
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.moreless
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.moreless
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.moreless
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.
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.
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
A fun game gets all too real when one of the players gets murdered by a killer and another player is held for ransom.
The team has to figure out what secret a wealthy family is hiding after they are a victim of a home invasion.
The team has to figure out what would lead a stalker to viciously murder a cage fighter.
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.moreless
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 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.moreless