The Rookie is set to reunite Nathan Fillion with another of his former Castle co-stars.
TV Line reports that Toks Olagundoye has been cast in the ABC drama in the role of Fiona Ryan, Officer John Nolan's (Fillion) professor in his Ethics and Criminal Justice class.
Professor Ryan will be part of a multi-episode arc in the series' third season with her debut set for the February 21 episode, which is titled 'Revelations'.
Olagundoye appeared in the eighth and final season of Castle as Hayley Shipton, a British former police officer and MI6 operative.
The Rookie has so far seen appearances from Castle alums including Seamus Dever, Jon Huertas, Annie Wersching and Frances Fisher.
The series was created by Alexi Hawley, who was a showrunner for Castle's eighth season.
Earlier this month, Titus Makin, who plays rookie officer Jackson West, revealed that he contemplated leaving the show if it didn't address the issue of his character being a Black cop in season three.
"I woke up one morning and I was watching the news, and I was like, 'I can't do this. I can't go play a cop on a show and not talk about the fact that I'm a Black cop.' My character hadn't addressed any of that," Makin explained.
"I had that conversation with Alexi, our showrunner, and he was extremely gracious and he totally understood everything I was saying.
"I did come to that point where I was like, 'If you want to write me out, I politely receive that. I would rather be written out than ignore the reality and not be able to tell the story.'"
He added: "I'm extremely grateful that ABC and The Rookie has given us a platform and have been so willing to tell these tricky stories.
"It's something that they very well could have ignored, but they don't want too. They've been great about like, 'Let's go for it. Let's create the conversations. Let's open up the floor.'
"I'm just thankful to be a part of the show that's willing to do that."
The Rookie airs on ABC in the US, and airs on Sky Witness in the UK. It can also be streamed on NOW TV.
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