Nathan Fillion to Star in ABC's 'The Rookie'

Bob D'Amico/ABC

Pictured: Nathan Fillion as Richard Castle in Castle

Nathan Fillion—who starred on ABC's Castle for eight seasons—is returning to the network with a new cop dramedy called The Rookie.

"Such a dream to be fighting crime again with @NathanFillion," former Castle showrunner and Rookie writer-producer Alexi Hawley tweeted Thursday.

ABC Boss on Castle's Demise

ABC Boss on Castle's Demise

'We were always very upfront with the studio and producers about the possibility that we might not be bringing back the show for Season 9' said the show is based on the true story of the oldest rookie on the Los Angeles Police Department. Fillion is 46 in real life.

The Hollywood Reporter said ABC ordered The Rookie straight to series, instead of going through the pilot tryout process.

By Karen Butler

Originally published in UPI Entertainment News.