Luke Kirby is signing on as new character Detective Sergeant John Darcy in the upcoming fourth season of Law & Order Toronto: Criminal Intent.

And Aden Young is leaving as the character Det. Sgt. Henry Graff after three seasons with the Citytv series from Lark Productions and Cameron Pictures Inc., in association with Universal International Studios.

Kirby’s character has been called up from Guns & Gangs to partner in homicide with Detective Sergeant Frankie Bateman, played by Kathleen Munroe. Kirby earned a primetime Emmy award for his portrayal of Lenny Bruce in The Marvelous Mrs. Maisel, and recently starred in The Last Thing He Told Me for Apple TV+.

“From the moment we began imagining this next chapter, Luke stood out as the ideal choice. He brings a sharp intelligence and emotional depth that perfectly aligns with the kind of storytelling Law & Order Toronto: Criminal Intent is known for. His work is grounded, unpredictable, and deeply character-driven, which makes Detective Darcy an immediate and fascinating presence on our team. We’re incredibly excited to welcome him to the series,” Tassie Cameron, executive producer of the series, said in a statement.

Production on the fourth season is underway in Toronto, with a fall 2026 launch set for the Canadian series. Besides Munroe, other returning cast members include Karen Robinson (Inspector Vivienne Holness), K.C. Collins (Deputy Crown Attorney Theo Forrester), Nicola Correia-Damude (Pathologist Dr. Lucy Da Silva), and Araya Mengesha (Tech Expert Mark Yohannes). Law & Order Toronto: Criminal Intent is based on the international format created by Dick Wolf and developed by Rene Balcer for Universal Television.

Tassie Cameron is the series showrunner and executive producer alongside Erin Haskett, Amy Cameron, David Valleau, Alex Patrick, Wanda Chaffey, and Tex Antonucci.

NBCUniversal Global TV Distribution handles distribution for Law & Order Toronto: Criminal Intent.

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