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- Season 12 overviewSep 21, 2011-May 9, 201222 episodesSeason 12 episodes1. 73 Seconds Sep 21, 2011
- After multiple attacks on a public tram, the team has just one witness and a lot of questions.
- 2. Tell Tale Hearts Sep 28, 2011
- When three people confess to killing a family, the team must decide who is telling the truth.
- 3. Bittersweet Oct 5, 2011
- During a date, Stokes discovers decomposing body parts in part of an art exhibit.
- 4. Maid Man Oct 12, 2011
- The team searches history for clues when the former Mayor of Las Vegas is shot at a mob museum.
- 5. CSI Down Oct 19, 2011
- The team searches for a medevac helicopter that was hijacked with Brody aboard.
- 6. Freaks & Geeks Nov 2, 2011
- When a woman's body is found near a traveling sideshow, the team encounters unusual characters.
- 7. Brain Doe Nov 9, 2011
- The CSIs discover a brain without a corresponding body at a crash site.
- 8. Crime After Crime Nov 16, 2011
- After three seemingly unrelated murders occur, the team uncovers a plot for revenge.
- 9. Zippered Dec 7, 2011
- The team works with the FBI to investigate the death of a ballistics expert.
- 10. Genetic Disorder Dec 14, 2011
- When Dr. Robbins' wife finds a nude corpse in their bedroom, it begins an investigation.
- 11. Ms. Willows Regrets Jan 18, 2012
- When a professional hit takes place at a law firm, Willows helps the FBI investigate.
- 12. Willows in the Wind Jan 25, 2012
- The team must say goodbye to Catherine Willows after she makes a life-altering decision.
- 13. Tressed to Kill Feb 8, 2012
- When woman is found dead, the team discovers clues that lead to a killer with a hair fetish.
- 14. Seeing Red Feb 15, 2012
- Russell seeks advice from a former colleague during an investigation into the death of a woman.
- 15. Stealing Home Feb 22, 2012
- The CSIs try to determine how an entire house was stolen off its foundation.
- 16. CSI Unplugged Feb 29, 2012
- When a child is abducted during a blackout, the team investigates using old-school methods.
- 17. Trends With Benefits Mar 14, 2012
- A photo of a dead college student starts trending on the Internet.
- 18. Malice in Wonderland Mar 21, 2012
- The team investigates a robbery/homicide at an "Alice in Wonderland"-themed wedding.
- 19. Split Decisions Apr 4, 2012
- When a man is shot at a casino, the team shuts the building down to look for the killer.
- 20. Altered Stakes Apr 11, 2012
- The team works to prove the guilt of an inmate whose conviction is about to be overturned.
- 21. Dune and Gloom May 2, 2012
- The CSIs investigate when a bomb kills an off-road race truck driver during a race.
- 22. Homecoming May 9, 2012
- When three dead bodies turn up a few blocks from a campaign dinner, the team makes a discovery.