CSI: Crime Scene Investigation: Season 4
Season 4 of CSI: Crime Scene Investigation continues the long‑running narrative of the Las Vegas forensic unit across twenty‑three episodes. The series follows a team of highly trained investigators who examine crime scenes, collect and analyze physical evidence, and reconstruct events to solve murders, assaults, and other violent crimes. Building on the foundation established in earlier seasons, the fourth season ma
Season 4 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- CSI was created by Anthony E. Zuiker and premiered on October 6, 2000.
- The series centers on a Las Vegas forensic investigation team trained to solve crimes through detailed evidence analysis.
- William Petersen and Marg Helgenberger star as lead investigators in the early seasons.
- Season 4 continues the show’s overarching saga and consists of twenty‑three episodes.
Season overview
Season 4 of CSI: Crime Scene Investigation continues the long‑running narrative of the Las Vegas forensic unit across twenty‑three episodes. The series follows a team of highly trained investigators who examine crime scenes, collect and analyze physical evidence, and reconstruct events to solve murders, assaults, and other violent crimes. Building on the foundation established in earlier seasons, the fourth season maintains the show’s focus on scientific methodology, detailed laboratory work, and the personal dynamics among the investigators as they confront increasingly complex cases. The season’s episodes further develop the overarching saga of the department, highlighting the pressures of high‑profile investigations in a city known for its nightlife and tourism. While the core premise remains the same—using forensic science to uncover truth—the season expands the scope of the team’s challenges, reinforcing the series’ reputation for combining procedural drama with intricate storytelling set against the backdrop of Las Vegas.
Episode Guide
Season 4 Progress Shield
Assume Nothing (1)
Sep 24, 2003 · 44 min
Two couples meet in a bar and one of the couples is murdered. When a second couple is murdered in a similar fashion the team suspects a pair of serial killers are on the loose. The
All for Our Country (2)
Oct 1, 2003 · 43 min
When the lead suspects in Grissom's serial killer case are murdered, Grissom suspects an inside job. Grissom and Brass are at odds when Grissom suggests it was a cop. Catherine and
Homebodies
Oct 8, 2003 · 42 min
Grissom and Warrick get the case of an old woman found mummified in her closet. Sarah and Nick arrive to investigate a breaking and entering to find a raped teen. These cases are n
Feeling the Heat
Oct 22, 2003 · 44 min
During Vegas's latest Heat wave of triple digit temperatures, Gil and Catherine investigate a baby locked in a car. Warrick investigates a man dead of an apparent heat stroke in hi
Fur and Loathing
Oct 29, 2003 · 44 min
The team is introduced to the ""Furry"" side of Vegas when a man is found dead on the side of the road, dressed in a racoon suit. Elsewhere in Vegas, a gunshot victim is found in a
Jackpot
Nov 5, 2003 · 45 min
A severed head is shipped to Dr. Robbins from Jackpot, Nevada. Grissom goes to Jackpot to find the rest of the body and gets very little cooperation from the locals. Catherine gets
Invisible Evidence
Nov 12, 2003 · 45 min
Warrick's appearance at the preliminary hearing on a rape and murder case goes terribly wrong when the only piece of evidence is thrown out on a technicality. Grissom and the team
After the Show
Nov 19, 2003 · 45 min
A suspect's infatuation with Catherine results in her taking over a high profile case. The case is a missing woman who aspired to be a showgirl. Sara and Nick are angered since it
Grissom Versus the Volcano
Dec 10, 2003 · 43 min
The sheriff is under political pressure to find who killed an air marshall with a car bomb that the sheriff witnessed. Grissom, Catherine and Nick are pressured to produce results.
Coming of Rage
Dec 17, 2003 · 44 min
A teenager is found murdered on a construction site. Grissom, Sarah, and Warrick follow the lead of blood on a hammer. Nick, with an assist from Catherine, tries to find how a woma
Eleven Angry Jurors
Jan 8, 2004 · 42 min
The lone holdout on a jury is found dead in the jury room. The eleven jurors who were voting guilty and who hated the dead juror are the natural suspects. Nick reopens a four year
Butterflied
Jan 15, 2004 · 45 min
A woman found murdered in her home. Her resemblance to Sara causes Grissom to take a personal interest in the case and forces him to examine the decisions he has made in his life.
Suckers
Feb 5, 2004 · 45 min
Three little CSIs (Grissom, Sara, and Nick)respond to an electrocution at a casino. The casino is hosting Japanese antiquities. The electroctution is just a ruse to steal the centr
Paper or Plastic
Feb 12, 2004 · 44 min
A robbery at a grocery store results in a shootout leaving five dead. The police officer at the scene believes Grissom has a grudge against him. The entire team has to process the
Early Rollout
Feb 19, 2004 · 45 min
The whole team must investigate a crime where a husband and his porn star wife were murdered execution style. Things get personal for Catherine when Grissom talks to her about her
Getting Off
Feb 26, 2004 · 43 min
Catherine and Sara deal with the death of what at first seems to be a transvestite. Later during autopsy they find out that the make-up he seemed to be wearing was actually facepai
XX
Mar 4, 2004 · 44 min
A mutilated female body is discovered tied to the undercarriage of a bus carrying prisoners from a women's correctional facility after a severed arm flies out from beneath the vehi
Bad to the Bone
Apr 1, 2004 · 44 min
A violent murder in a casino parking garage and another episode in the police interview room lead the CSIs to one shocking discovery after another. The case involves a missing woma
Bad Words
Apr 15, 2004 · 45 min
Warrick, Catherine, and Nick try to determine the cause of a house fire that kills a teenage kill. The fire is in the same neighborhood as a similar arson fire. Grissom and Sara in
Dead Ringer
Apr 29, 2004 · 43 min
Grissom, Catherine and Nick investigate the death of a runner during a competition. Meanwhile Sara and Warrick investigate the death of couple in a hotel room, initially thought t
Turn of the Screws
May 6, 2004 · 44 min
A roller coaster runs off track leaving 6 people dead. The CSI team must uncover whether this was an accident, or foul play. Warrick and Catherine try to find the killer of a 13 y
No More Bets
May 13, 2004 · 44 min
Two men are found murdered after scamming Sam Braun's casinos. Grissom and Warrick investigate after Catherine is thrown off the case. One of the suspects is the son of a man Braun
Bloodlines
May 20, 2004 · 44 min
A casino employee is beaten and raped on her way home from work, but she survives and identifies her attacker. Unfortunately, a DNA test sets him free and Grissom must wrestle with