E1 - 73 Seconds

Aired: September 21, 2011

After multiple attacks on a public tram, the team has just one witness and a lot of questions.

E2 - Tell-Tale Hearts

Aired: September 28, 2011

When three people confess to killing a family, the team must decide who is telling the truth.

E3 - Bittersweet

Aired: October 05, 2011

During a date, Stokes discovers decomposing body parts in part of an art exhibit; D.B. Russell deals with a staff member confrontation.

E4 - Maid Man

Aired: October 12, 2011

The investigators attend the gala grand opening of a mob museum, only to witness an attempted hit on mob lawyer and former mayor Oscar Goodman.

E5 - CSI Down

Aired: October 19, 2011

The CSI unit investigates when Frank, an apparent murder victim, sits up and needs help but is he just another victim?

E6 - Freaks & Geeks

Aired: November 02, 2011

The murder of a popular sideshow performer sends the team behind the scenes at a carnival freak show.

E7 - Brain Doe

Aired: November 09, 2011

The CSI crew is stumped when they discover a disembodied brain at a crime scene where all the other brains are accounted for.

E8 - Crime After Crime

Aired: November 16, 2011

Three new murders related to three unsolved (or incorrectly solved) crimes from the past come back to haunt the CSIs.

E9 - Zippered

Aired: December 07, 2011

The murder of a retired Army Ranger brings the FBI in on the case, to Russell and Catherine's initial chagrin.

E10 - Genetic Disorder

Aired: December 14, 2011

When a man's dead body turns up naked in the bed of Doc Robbins' wife, the detectives try to "just work the scene" without bringing their pre-judgments to the table, but it sure looks like a case of Death During Adultery.

E11 - Ms. Willows Regrets... (1)

Aired: January 18, 2012

Catherine's friend Laura's mogul husband Mark has a lot to hide behind his successful international corporation, and he's hired a crack team of assassins to carry out the murders of anyone who might be aware of what he's doing, and that includes Laura's lawyer and Laura herself.

E12 - Willows in the Wind (2)

Aired: January 25, 2012

The CSI team says goodbye to Catherine Willows as she makes a life-changing decision.

E13 - Tressed to Kill

Aired: February 08, 2012

When a woman is found dead and her hair is done up '70s style complete with vintage clothes, the CSI team discovers clues that point to a killer with a hair fetish.

E14 - Seeing Red

Aired: February 15, 2012

Russell seeks advice from a former colleague during an investigation into the death of a man's ex-girlfriend.

E15 - Stealing Home

Aired: February 22, 2012

When a house is stolen completely off its foundation, the CSIs are on the case in search of answers. Meanwhile, new CSI Julie Finlay showcases her skill in blood analysis.

E16 - CSI Unplugged

Aired: February 29, 2012

When a blackout cripples the city, the CSIs must revert to old-school methods to solve the case of a missing child.

E17 - Trends with Benefits

Aired: March 14, 2012

When a photo of a dead college student starts trending on the Internet, the team steps in to investigate.

E18 - Malice in Wonderland

Aired: March 21, 2012

The team has few leads to go on when investigating a robbery-homicide at a themed wedding

E19 - Split Decisions

Aired: April 04, 2012

When the CSI team is called in to investigate a man who is shot at point-blank range in a local casino, they shut down the entire building to find their killer.

E20 - Altered Stakes

Aired: April 11, 2012

When Stokes learns that a man he helped put in prison is going to have his conviction overturned, the CSI team needs to prove the killer is guilty again or he will be released.

E21 - Dune and Gloom

Aired: May 02, 2012

When a bomb kills an off-road race truck driver mid-race, the CSI team is called on the scene to investigate why.

E22 - Homecoming

Aired: May 09, 2012

Season finale: The investigation of a triple homicide leads to the discovery of corruption running rampant throughout the LVPD. The closer they get to the truth, the more serious are the repercussions. To be continued...