The newest member of the CSI team, Jo Danville, a former FBI agent, is welcomed to her new job by stumbling upon the body of a young woman murdered somewhere in the building that houses the NYPD Crime Lab

When a young woman appears to be strangled while participating in a live online chat that Adam witnesses, the CSIs must determine if it was real or a hoax, and locate where the possible victim is.

When a married couple is found beaten in their home, a mother identifies her son as the killer and the CSIs believe they have their suspect, but all is not what it seems when another witness comes forward

When the leader of a powerful New York gang, El Puno, is found murdered, the CSIs must find the killer before a street war with a rival gang breaks out. Mac asks the co-founder of El Puno, Luther Devarro, a man he put behind bars years before

A jewel heist at the penthouse of one of New York's most powerful attorneys takes a bizarre turn and the case leads the CSIs to a seemingly unrelated man in the morgue.

In (s7e6) on a rooftop, the badly rotting body of a person is found in an abandoned car. On the trail of the killer, Mac and the team are able to locate the parents of this decomosed body. They also realise that the killer is cunningly using the parents to manipulate and confuse the crime scene. Will the killer be caught, inspite of his cunning planning?

When a sniper goes on the prowl from the rooftops of New York City, Mac is forced to relive the horrors of a brutal abduction case that may have created one of the deadliest foes the CSIs has ever faced.

When the CSIs experience eerie occurrences after finding a female victim who appears to have been literally scared to death, the case takes another strange turn when Mac discovers a second victim.

When a woman's body washes up at the South Street Seaport, the CSIs unravel a dark secret from Deputy Chief Carver's past that threatens to shatter his stellar reputation and close-knit family.

Mac and the team search for the killer of a department store manager who was found dead in a holiday display window.

When a man in full clown costume shoots a bakery owner, the CSIs investigate and discover a decision from Flack's past that may put him in jeopardy.

When a Spanish club promoter is found dead, Mac must battle with the head of Barcelona's crime lab to solve the case.

When a tractor-trailer carrying exclusive party guests mysteriously ends up at the bottom of the Hudson River, the CSIs must solve the mystery from the soggy remains.

When the CSIs track down a suave and charming hitman, their investigation uncovers a conspiracy with far-reaching implications.

When a serial rapist is found murdered, restrained in the same manner as his victims, the CSIs weigh a feeling of justice against their sense of duty to pursue the killer.

When a conspiracy-obsessed woman is found dead, the CSIs investigate and discover that some of her theories may have had some truth to them.

When a popular student and star pupil at Manhattan's most elite private school is murdered, the CSIs find themselves immersed in the highly competitive world of over-privileged youth.

Jo balances personal and professional challenges when her adopted daughter, Ellie, is the key witness in a murder investigation.

The team enters the competitive world of gourmet food trucks when one explodes at a SoHo food festival while Hawkes is there with his girlfriend.

Wondering if the death of a woman is the work of a serial killer, what with two women already dead, and a third woman, missing, in (s7e20) Mac and the team start their investigations. When an ex-convict who Mac had put away some time back, starts stalking him, Mac re-connects with his first partner, hoping together they will once more arrest the convict.

When the crime lab is attacked, Danny and Mac's handling of the suspect results in an investigation by Internal Affairs.

Following a near-death experience, Mac becomes determined to close his last remaining unsolved case.