| Castle (season 8) | |
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| Starring | |
| Country of origin | United States |
| No. of episodes | 22 |
| Release | |
| Original network | ABC |
| Original release | September 21, 2015 – May 16, 2016 |
| Season chronology | |
The eighth and final season of American crime-comedy-drama television series Castle was ordered on May 7, 2015, by ABC. The season premiered on September 21, 2015, in the United States on ABC, and the finale aired on May 16, 2016. The season consisted of 22 episodes.
On April 18, 2016, ABC and ABC Productions announced that Stana Katic and Tamala Jones would not return for Castle's ninth season, should it be renewed. Despite several other cast members having signed on for a ninth season, on May 12, 2016, it was announced that the show would be cancelled instead; the final episode aired on May 16, 2016.
Richard Castle (Fillion) is a famous mystery novelist who has killed off the main character in his popular book series and has writer's block. He is brought in by the NYPD for questioning regarding a copy-cat murder based on one of his novels. He is intrigued by this new window into crime and murder, and uses his connection with the mayor to charm his way into shadowing Detective Kate Beckett (Katic). Castle decides to use Beckett as his muse for Nikki Heat, the main character of his next book series. Beckett, an avid reader of Castle's books, initially disapproves of having Castle shadow her work, but later warms up and recognizes Castle as a useful resource in her team's investigations.
Castle was renewed for an eighth season on May 7, 2015. Following the seventh season, David Amann stepped down as showrunner, and writer Terence Paul Winter and Alexi Haley were hired as the new showrunners for the eighth season.TVLine announced on July 7, 2015, that Toks Olagundoye had been added as a series regular for the eighth season, playing former Scotland Yard police officer Hayley Vargas. Filming for the eighth season started on July 17, 2015 and ended in April 2016. A promotional poster was released on August 10, 2015, by ABC.