The fifth season of Law & Order: Criminal Intent premiered on NBC on September 25, 2005, and ended on May 14, 2006.
This season featured the series's first two-part episode and "Cruise to Nowhere" was referenced later for an eighth season episode titled "All In".
This season of Law & Order: CI remained in its time slot of NBC Sunday's at 9PM/8c, its final season in this slot on NBC; its move to Tuesdays in the sixth season caused a ratings decline. During the 2005–2006 network TV season episodes were up against episodes of Desperate Housewives on ABC and episodes of Family Guy and American Dad! on Fox. The show "roller coasted" in the ratings with the competition, but NBC executives were impressed with the 11 million viewers per week it was able to retain.
Detectives confront lethal nemesis Nicole Wallace in the wake of a murder; Ex-'Law & Order' star Chris Noth returns to the cast as Mike Logan.
Are diamonds a killer addict's best friend? Chris Noth and Annabella Sciorra join the cast.
Why was a kidnapped wife living happily ever after with another man for ten years?
Detectives Logan and Barek intercede in mob war in search of dirty police.
After an esteemed nun is slain in church, detectives re-discover related cold-case crime.
Both sets of series detectives probe into the disappearance of an Iowa teen during her trip to New York.
Part 2 of 2. A Midwestern teenager disappears during a school trip to New York, and a related missing young woman leads them to the son of a high powered judge, who finds himself on the wrong side of the law.
A medical student is murdered after she returns to New York from Guatemala.
A hotshot computer whiz is found dead, and his suspected killer is himself a victim of bizarre psychological torture.
A woman bribing lovers with baby photos to imply paternity gets in over her head.
A gypsy group of con artists posing as real estate agents prey on wealthy newcomers in town.
A woman’s body falls from the wheel well of an airplane. Brad Renfro and Ethan Embry guest-star.
A rich mogul's son is killed, and all eyes are on his much younger, very ambitious Chinese wife.
A secret service agent is bludgeoned to death.
A young man is killed after stealing private medical records.
A young violin prodigy whose mother is an opera star is found dead, and the crazy maestro is the prime suspect.
A tourist is killed and the prime suspect is an actor.
Two young women are murdered in a bizarre ritual.
A socially connected educator who leads a double life as a major gambler dies.
A string of gruesome robberies and murders are committed and they are linked to a ring of delinquents and their foster mother.
The detectives hunt down an arsonist targeting churches.
In the season finale, a successful couple is brutally murdered and their drugged up son is the prime suspect.