Nathan Fillion is already preparing for life after Castle less than 24 hours after ABC canceled the 8-season procedural.

In response to the news, the actor tweeted a specific request to his fans asking for their help as he looks for his next role. "Dear Fans, In whatever project I do next, loudly notice how unlike Castle and fresh and versatile I am. Thanks," he said in hopes of convincing future casting directors he can be more than the self-assured police consultant.

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Fans aren't the only ones getting put on notice. Fillion also sent out a tweet informing directors that he's available for casting.

It wasn't all jokes and sarcasm though. Fillion also sent out a heartfelt thanks to the cast and crew of Castle for all of the hard work they put into the show to make it a success for the past eight years.

ABC announced Thursday night that the show would be ending after its current season. The news came as a bit of a shock after it was revealed that Fillion's co-star Stana Katic wasn't invited back for the potential ninth season. Executive producers had prepared for the scenario though, by filming an alternative ending to the planned season finale in case the episode became their last.

Castle's series finale airs Monday at 10/9c on ABC.