After years of pursuit and a countless number of murders, Langston comes face-to-face with serial killer Nate Haskell inside the house where his killing spree began.

Langston becomes more determined than ever to track down Nake Haskell, the notorious "Dick & Jane" killer, after discovering that he's kidnapped his ex-wife, Gloria.

Following his escape, Nate Haskell, the notorious "Dick & Jane" killer, resurfaces when he e-mails a disturbing video to the father of one of his brides, threatening to take her life.

Langston and Sara turn to Lady Heather for help in tracking down the culprit responsible for injuring a woman before she was seemingly mauled to death by a mountain lion. Meanwhile, Nick and Dr. Robbins manage to rescue the unborn baby of a teenage girl who appears to have committed suicide.

String of deaths, including a gamer found dead on his couch and a newly divorced man at the bottom of a pool, instigate a bet among the CSIs as to whether they've "hit for the cycle" - a homicide, a suicide, an accidental and a natural death all in one night.

While investigating the murder of a convicted ex-cop, the CSIs stumble upon a list in his prison cell with names of several individuals he believed might have been his wife's true killer.

The CSIs are on zombie alert when two men initially pronounced dead mysteriously come back to life.

Langston testifies against the notorious "Dick & Jane" killer, Nate Haskell. Meanwhile, Nick receives a call from troubled teen Jason McCann to warn him of impending danger.

Thrift store donation turns gruesome when a dead body is found in a box; meanwhile, Langston's wife pays a surprise visit to the crime lab.

Night full of celebration ends with a bang when the director of a scholarship foundation for the deaf is killed by a deadly car bomb, prompting Sara to interrogate the students and faculty of the college where her mother-in-law works.

The CSIs link a body with severe burn marks to possible execution by electric chair - and to a legendary Vegas murder. Meanwhile, Greg asks out Ellen, a pretty schoolteacher and forensics enthusiast who has been touring the crime lab.

The CSIs question the validity of an online picture depicting a murdered call girl until they find the same woman strangled to death in the dumpster that appears in the photo.

The CSIs set out to track down a pedophile suspected of murdering an FBI agent's wife and kidnapping his children.

Man's fatal fall from a hotel balcony launches the CSIs into an investigation to determine if his death was suicide or the result of foul play.

Two men are murdered right before exposing a natural gas company for poisoning residents in a farming town, and the CSIs must discover who is responsible for their deaths.

When the CSI team discovers the shredded remains of a man, they find themselves with multiple suspects who may be responsible for his death.

When a college student ends up dead after a "Walking with Dinosaurs" show, the CSIs must determine if his death was murder or accidental.

Woman who suffers from a condition called "hoarding" becomes a murder suspect when a dead body is found buried under piles of trash and debris inside her home.

Sqweegel, a serial killer who is punishing local heroes that harbor hidden secrets, is on the hunt in Las Vegas.

Vampire and werewolf convention is at the heart of a murder investigation in Las Vegas.

Hysteria ensues when a shark attacks a woman in the pool at a Las Vegas casino "day club," and the CSIs must determine if the killer is human or shark.

Langston fights for his life after being stabbed by psychopath Nate Haskell, while the other CSIs attend a funeral that turns deadly.