Chris Geraghty Cast The Alienist TNT Teddy Roosevelt

Brian Geraghty Cast as Lead of TNT's The Alienist, Replacing Sean Astin

TNT’s upcoming detective drama The Alienist has found a new lead actor.

Chicago P.D. alum Brian Geraghty will replace Sean Astin in the lead role of future U.S. President Teddy Roosevelt, our sister site Deadline is reporting. “Unfortunately because of scheduling difficulties, Sean Astin will no longer play the role,” the network said in a statement.

Adapted from Caleb Carr’s bestseller, the crime thriller is set in 1896 New York, where a young Roosevelt, as the newly-named NYPD commissioner, is investigating a string of brutal murders involving boy prostitutes. He enlists an “alienist”/criminal psychologist (played by Daniel Brühl) and a newspaper illustrator (Luke Evans) to help solve the heinous crime. Dakota Fanning and Q’orianka Kilcher also star.

The drama, which got a straight-to-series order from TNT, is currently filming in Budapest, and with Astin also filming Season 2 of Netflix’s Stranger Things in Atlanta, Deadline says the amount of travel required to do both was too much to overcome.

Geraghty played cop Sean Roman for two seasons on Chicago P.D., wrapping up his run last May. His other TV credits include True Blood, Boardwalk Empire and Ray Donovan.

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  1. Dani says:

    A crime tv show following a future president? It’s such a good cast, but this sounds like an SNL skit not a tv show

    • Alice says:

      In the book the show is based on, Roosevelt is there as a catalyst to start the investigation, not an investigator himself. It sounds like the show may be expanding Roosevelt’s involvement in the action.

      • Dani says:

        I would still find it a little gimmicky, but it would definitely not sound crazy if the president was only a bit player here and there.

        • msemmyjones says:

          The book is really good and has loads of real people peppered throughout. And considering Roosevelt truly was the police commissioner of New York City before he was president, I don’t see why it would be gimmicky to see a TV show about him in that role. Though in this instance I will be disappointed to see his role expanded too much (he’s def not the lead in the book). It’s just unnecessary and doesn’t make much sense. There’s lots of reasons​ the investigation they’re undertaking if off-book.

          • Dani says:

            In my opinion, a tv show about his role as police commissioner = not a gimmick, a show about him as a police commissioner who actively goes out and solves crimes = gimmick because that’s not even close to what a commissioner does. I’ll have to wait for the show to come out to be able to say this as a fact or not, but it sounds like a gimmick because people will be pulled in to see a show about young teddy but end up with something else. If they stuck more with the idea of him being a supporting character then I wouldn’t find it gimmicky, but that’s just me

  2. ninergrl6 says:

    Interesting premise. Reminds me of Newsies but darker and without singing. Lol Too bad Astin had to back out. I’d tune in just for him.

  3. Sarah Teresa says:

    Great cast

  4. Annemarie says:

    Is this based on the book?

    • Alice says:

      It is, though from what I’ve read about the series it sounds like Roosevelt is playing a bigger part than he did in the book.

  5. msemmyjones says:

    Um… Roosevelt’s definitely NOT the lead character. Important, sure, but definitely second string in comparison to Kreizler, John, Sara, and the Isaacsons.

  6. Geo says:

    Glad they’re making a show out of it, since it was such rich material. Always disappointed that Caleb Carr never returned to it to write another book in the series.

    • L.S. says:

      He did. Angel of Darkness. Then this past year Surrender, New York released, which is loosely tied to Kreizler’s work.

  7. L.S. says:

    Why are they changing John Schuyler Moore now an illustrator? His character was a crime reporter for the Times, which was why he was brought onto the team.
    I’m not sold, but definitely curious.