A riot threatens to break out at a Manhattan precinct after an officer shoots and kills an allegedly unarmed black man during a chase.

The team solves three separate murders which occur on Valentine's Day. The CSI team and detectives all have their own valentine's celebrations.

With the help of D.B. Russell from the Las Vegas crime lab, Mac is able to identify the people who kidnapped Christine. But will he get to her before it's too late?

A pizza shop employee is killed over a package he was smuggling that was mistaken for drugs.

The team tries to figure out who killed a pick-pocket who fell from a building balcony onto a car, and Jo gets a visit from a man who has shocking news related to her dead sister.

A police officer is killed during a robbery, but is a gunshot victim in police custody a reluctant eyewitness or one of the robbers?

Two people are shot and killed with a gun that was printed from a computer, and Jo tries to uncover the identity of an anonymous philanthropist who is giving away millions of dollars to random New Yorkers.

CSI tries to figure out who killed one of the owners of a modern-day speakeasy, and Adam tries to get through unresolved issues while taking care of his sick father.

The team discovers that a Dominican gang member found cut in half by a chainsaw has a connection to Flack's new partner.

The team connects the murder of a high schooler to a classmate who was dealing his prescription meds, and Lindsey returns home to take care of some unfinished business.

The team must solve a series of murders whose victims, locations, and murder weapons all resemble elements of the board game "Clue."

While searching for a gun, the team stumbles on a dead body at the bottom of a Central Park pond.

A 20 year old cold case involving a missing boy is reignited when the suspected killer is murdered after returning to the old neighborhood.

CSI searches for the shooter at a political rally, and the gun that he discarded in an alley afterwards is used in the accidental shooting death of a young girl.

A homicide on the Brooklyn Bridge leads Mac and Jo all the way to San Francisco to find a missing teenage girl, but they are not sure if she is dead or alive.

Arsonist Leonard Brooks strikes again, but CSI discovers that his mission this time is very personal.

Mac needs the help of a convicted arsonist recently released from prison to investigate the death of one of his FDNY firefighter friends.