When the Castle crew heads to Hollywood in May, awaiting them will be new actors in the roles of Javier Esposito and Kevin Ryan.Chillax! Fan faves Jon Huertas (Esposito) and Seamus Dever (Ryan ...

Fans of Castle will know Dever as Detective Kevin Ryan, one-half of the series' best non-romantic couple, along with his best friend and partner, Javier Esposito (played by Jon Huertas).

Of course, everyone also loved the other side characters, especially Jon Huertas’ Javier Esposito and Seamus ... a few other Castle actors have guest starred in the ABC show.