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- Season 4 overviewOct 2, 2003-May 20, 200423 episodesSeason 4 episodes1. Assume Nothing; All for Our Country Oct 2, 2003
- Team scours security tapes for clues to a double homicide; murder suspects are found shot to death.
- 2. All for Our Country Oct 2, 2003
- Grissom receives a jolt when murder suspects are found shot to death.
- 3. Homebodies Oct 9, 2003
- Investigators find a woman's mummified corpse locked in a closet; a boy shoots himself.
- 4. Feeling the Heat Oct 23, 2003
- The team investigates the deaths of a child left in a hot car and a woman who washed up on a beach.
- 5. Fur and Loathing Oct 30, 2003
- A team explores the world of fetishes after finding a dead man dressed in a raccoon costume.
- 6. Jackpot Nov 6, 2003
- Grissom travels to a small town in northern Nevada where a dog has found a human head.
- 7. Invisible Evidence Nov 13, 2003
- After a court disallows evidence, the team must find new facts to convict a suspect.
- 8. After the Show Nov 20, 2003
- Catherine leads an investigation to find a model who has been missing for several days.
- 9. Grissom Versus the Volcano Dec 11, 2003
- The CSI team is called to investigate a car bomb explosion and the death of a musician's wife.
- 10. Coming of Rage Dec 18, 2003
- A teenager is beaten to death with a hammer; a gunshot victim is in her own house.
- 11. Eleven Angry Jurors Jan 8, 2004
- A holdout juror is murdered behind closed doors during deliberations.
- 12. Butterflied Jan 15, 2004
- Grissom investigates the murder of a woman who looks like Sara.
- 13. Suckers Feb 5, 2004
- Someone steals a rare piece from a 17th-century Japanese art.
- 14. Paper or Plastic? Feb 12, 2004
- The team investigates a multiple homicide that took place after a grocery store robbery went awry.
- 15. Early Rollout Feb 19, 2004
- Team probes the execution-style murder of a millionaire and his wife.
- 16. Getting Off Feb 26, 2004
- Illicit drugs and addiction are found while investigating a knifing.
- 17. XX Mar 11, 2004
- The body of a female inmate is found tied to the a prison bus.
- 18. Bad to the Bone Apr 1, 2004
- A loner beats a man to death with his bare hands, then dies in police custody.
- 19. Bad Words Apr 15, 2004
- A competitor at a gaming tournament ends up dead with an "S" tile lodged in his throat.
- 20. Dead Ringer Apr 29, 2004
- A murder investigation where all the victims and suspects are cops.
- 21. Turning the Screws May 6, 2004
- Investigators must determine whether a fatal roller coaster incident was an accident or foul play.
- 22. No More Bets May 13, 2004
- Two gamblers are found dead shortly after scamming several of Sam Braun's casinos.
- 23. Bloodlines May 20, 2004
- A rape victim identifies her rapist, but the DNA evidence suggests he is not the person responsible.