In Season 7 of Chicago P.D., the Intelligence Unit brought in a new undercover cop—Detective Ryan Lansing. Quiet. Observant. Loyal… or so it seemed.
Lansing quickly earned Voight’s trust. He handled high-risk operations. He backed Ruzek in the field. But then came Episode 10—when Voight’s entire case blew up after a key witness disappeared.
That’s when the twist unraveled.
Lansing had been working for Internal Affairs the whole time.
His mission? Expose Voight’s off-the-book tactics. Record illegal interrogations. Document cover-ups. And most of all—bring down the Intelligence Unit from the inside.
The reveal happened in silence. Lansing left his badge on Voight’s desk. A sealed folder with dozens of transcripts lay beside it. Voight stared. Lansing walked out—and never looked back.
Behind the scenes, the writers kept the twist hidden from even the cast. Jason Beghe (Voight) reportedly didn’t know about Lansing’s betrayal until the final table read. “That was real rage in his eyes,” said a crew member.
The betrayal tore through the unit. Ruzek blamed himself. Atwater questioned if Voight’s methods had finally gone too far. And Voight? He destroyed every camera in the interrogation room.
Fans were split. Was Lansing a traitor—or a hero?
Either way, the message was clear: No one outsmarts Voight… and lives to tell about it.
