Nathan Fillion prepared to hang up his LAPD uniform as season four of The Rookie wrapped up filming and he had a bittersweet message for fans.

The star shared a snapshot on Instagram in which his police wardrobe was hung up behind him and he captioned it with some poignant words.

“About to don the uniform one last time till season 5,” he wrote. “It’s been another challenging, yet rewarding year.

“This cast, these writers, the producers and crew have worked so extremely hard, all throughout the pandemic, to bring you all an hour a week to escape and enjoy some good entertainment.

“I’m so very lucky to be along for this journey, and luckier still to have it continue. I know what this job means to me, but what does #therookieabc mean to you? What’s been your favorite episode, your favorite character? (It’s ok if you say it’s me.).”

Nathan recently revealed the show had been renewed for another season and viewers were over the moon with the news.

Alongside a poster from the show, he wrote: “I couldn’t be more proud of what we have accomplished with this show.

“Congratulations to our cast, crew, writers, producers, casting directors, directors, and everyone who has lent their talents to #therookieabc over the years.”

He added: “This job brings me real joy, I look forward to many more episodes with you all. I’d also like to thank the fans who keep coming back.

“You keep watching ’em, we’ll keep making ’em. #therookieabc #season5. And thanks to ABC for the early pickup! It’s such a good feeling.”