The fourth season of Law & Order: Criminal Intent premiered on NBC on September 26, 2004, and ended May 25, 2005. The series remained in its time slot of Sundays at 9 PM/8c, but the season finale episode "False-Hearted Judges" aired on Wednesday, May 25, 2005 at 10 PM ET/9 CT.
Stars Vincent D'Onofrio, Kathryn Erbe, Jamey Sheridan, and Courtney B. Vance returned for the fourth season. Around mid-season, star Vincent D'Onofrio fainted twice from exhaustion, once on set and again at his home. Writers René Balcer and Elizabeth Benjamin won an Edgar Award in the category Best Episode in a Television Series Teleplay, for the episode "Want". Almost three months before the fourth season finale, it was announced Chris Noth would join the show in the fifth season, alternating episodes with D'Onofrio, due to his health issues at the time.
Detectives wonder why a controversial radio DJ was switched off permanently.
A world-renowned photographer dies in a bizarre car crash, and the murder is traced to a psychotic disciple with a horrible perversion.
A woman is killed and another left for dead, after a deranged man tries to give them homemade lobotomies. Neil Patrick Harris guest-stars.
Detective Goron confronts his murderous female nemesis who leaves behind a trail of victims. Olivia D'Abo guest-stars.
A leading atheist is killed during a kidnapping gone awry.
Several homeless men disappear and they are linked to an elderly auto parts dealer and his girlfriend who’s been harboring a secret for over 30 years.
A stressed out stay-at-home mother of four young boys is so depressed she blows up their car, but she survives, along with her oldest child, and responsibility for the murders is questioned. Sam Robards guest-stars.
A highly skilled silver burglar is suspected of murder when a top-flight appraiser is killed, but although he's a criminal, he's not a killer.
The world's most brilliant physicist and his research partner are trying to unlock one of the most complicated mathematical theories ever - until the partner is murdered, and the genius' life is threatened. Austin Pendleton guest-stars.
The residents of a ritzy building are shocked by the death of the head of the condo board, and when a nanny is accused of the crime because "God told her to do it," the cops are very suspicious.
A woman is mysteriously killed on her way to visit her in-laws.
A cop kills a nerdy collector of vintage toys after he hears him arguing with a woman. The woman turns out to be a con artist who preys on exotic fan club members, and she already has her next victim in line.
A federal prison guard is killed and Goren and Eames, with the help of Detective Mike Logan solve the case. Guest-star Christopher Noth reprises his "Law & Order" role.
A politician is front and center in the investigation into the death of an ex-centerfold and an extortionist who fought over the auctioned "little black book" of a skin magazine publishing czar. Rosanna Arquette and Peter Bogdonovich guest-star.
Restaurant wars prompt the meltdown of a young entrepreneur and the death of a renowned food critic after a food poisoning scare. Chris Penn guest-stars.
A man who tries to play God with organ transplants takes his mission too far, with deadly results.
A perverted killer haunted by horrible ideas strikes again, but the cops might not have the right guy, although they are close.
A family in witness protection is murdered when their adopted daughter goes behind their backs to find her birth parents.
A woman is poisoned with dioxin.
A group suicide turns into a murder investigation when it is apparent one of the victims was included against his will.
A young actress is shot to death in the Lower East Side, but what appeared to be a senseless street murder was in fact planned by those close to her.
A municipal city worker's husband is killed and she subsequently disappears.
Conservative judges are being murdered, and their personal views were responsible or their demise.