CSI: NY - Season 4 (2007)

The death of a scientist is connected to a time machine he allegedly created, while the death of a co-ed at a diner is connected to a drug study at her school and an initiation ceremony.

A murder victim bears a striking resemblance to a well-known avatar in the online role-playing game "Second Life." Mac is forced to enter the game himself to solve the mystery surrounding her death.

While Danny and Lindsay investigate a possible murder-suicide at a supposedly haunted house in Amityville, Mac and Stella tackle the case of a man who appears to have been killed after he already died.

Two seemingly unrelated murder cases become connected when CSI discovers that both involve female sexual assault victims and men who were charged with those crimes but not convicted.

CSI investigates the death of a woman who was part of a live billboard on Times Square, and a shooting during a robbery where the victim's "boyfriend" may be part of the crew.

A man about to be married is found dead in his dressing room on his wedding day, and Bonasera is left with a series of puzzles which are tied to an event in Taylor's past.

The clues in Bonasera's puzzle lead Mac back to Chicago, where he must confront a traumatic event from his youth. Bonasera also discovers that her admirer is directly connected to the case.

An Internet entrepreneur is killed by an exploding cigar, and Danny's neighbor's son is killed while under his care by a stray bullet fired in a bodega robbery.

A notorious hotel owner known for her meanness is found dead under an ice sculpture, and the clues to the demise of a second woman who fell to her death onto a school bus can be found in the book, "Peter Pan."

CSI investigates the murder of a family court judge who has lots of enemies. Meanwhile, Danny's neighbor Ricki steals his gun to go after Ollie, the bodega robber who caused her son's death.

A badly-burned corpse turns out to belong to an underground street luge racer, and the DNA of a man already in prison is found on a dead body discovered in a new high-tech public toilet.

Investigators believe that a corpse they found is that of a serial killer from their past. However, they soon discover that the body was made to look like the killer, and that the killer is after a new target.

While CSI investigates a fire in Stella's apartment building, Stella comes to the revelation an abducted child may have been staying with the woman who lived next door to her.

The bodies of two female real estate agents are found on a beach. When the m.o. ties the murders to a third murder from months earlier, CSI goes on a hunt to find the killer before he strikes again.

A high school guidance counselor is killed during a dance. The case may be connected to the sexual assault of one of the students by another classmate, and a deputy inspector's daughter holds the key to solving the crime.

CSI investigates the poisoning death of a fan at a basketball game, moments after making a million-dollar half-court shot. Meanwhile, the taxicab killer strikes again, and the team finds more clues about the killer's identity.

The search continues for the taxicab killer, who has now captured Reed and is forcing him to use his blog to publicize the next attack.

Mac is sent into a robbery/hostage situation at a bank at the robber's request to prove that the robber didn't kill a man found dead in the bank vault.