Homecoming
Season 12, Episode 22
The 12th season concludes with the CSIs investigating the murders of three people whose bodies are found a few blocks away from the site of a campaign dinner.
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A bomb kills the driver of an off-road race truck during a competition.
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A man Nick helped put in prison gets his conviction overturned and will be released, unless the CSIs can uncover evidence to prove he is guilty.
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A man is gunned down in a casino at point-blank range, and the CSIs shut down the building to find the killer.
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A murder and a robbery at an "Alice in Wonderland"-themed wedding are investigated. Meanwhile, Hodges wants his mother to believe that Morgan is his girlfriend.
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A college student is murdered, and her death photo ends up trending on the Internet. The CSIs investigate and turn to social media to help solve the case.
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A blackout cripples the city and forces the CSIs to revert to old-school methods to solve the case of a missing child.
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The CSIs investigate when a house is stolen from its foundation. Meanwhile, Julie displays her skills in blood analysis.
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Seeing Red
Season 12, Episode 14
Elisabeth Shue joins the cast as Russell's former colleague, who helps him investigate the death of a man's ex-girlfriend.
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The CSIs investigate the murder of a woman found dressed in vintage clothes with a 1970s hairstyle. The probe points to a killer with a strange hair fetish.
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Catherine makes the painful decision to leave CSI.
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Catherine works with the FBI to investigate a murder carried out by a professional hit man at a law firm she recommended to a friend.
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The CSIs investigate when Dr. Robbins' wife discovers a nude dead man in their master bedroom.
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Zippered
Season 12, Episode 9
The CSIs work with the FBI to investigate the murder of a rancher who was also a ballistics expert.
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The CSIs investigate three seemingly unrelated homicides and discover that someone is exacting revenge for cold-case murders that were never solved.
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Brain Doe
Season 12, Episode 7
A disembodied brain is found at the site of a car crash, but it doesn't belong to any of the victims. Meanwhile, Russell is concerned that his son isn't focused on college following a suspension from school.
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The CSIs investigate when a woman's body is discovered near a freakish attraction at a 19th century-inspired traveling sideshow.
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CSI Down
Season 12, Episode 5
The CSIs search for a hijacked medevac helicopter that's carrying Brody as a passenger.
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Maid Man
Season 12, Episode 4
A former mayor of Las Vegas is shot at the Mob Museum and the CSIs embark on a Vegas history lesson to find clues to the crime.
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Nick visits an art exhibit on a date and realizes that one work of art contains decomposing body parts.
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Three suspects each confess to murdering a family and the CSIs must determine which one is telling the truth.
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73 Seconds
Season 12, Episode 1
The 12th season begins with the lab getting a new supervisor (Ted Danson), who helps the CSIs investigate multiple shootings and stabbings on a public tram.
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