VIDEO : Nathan Fillion Will Miss 'Castle' Co-Star

Nathan Fillion, the title star of the ABC procedurial 'Castle' says he'll miss his 'Castle' co-star Stana Katic. There are rumors that on-set tensions led to Stana Katic's departure. Fillion has broken his silence about the Castle departure that crushed fans' hearts. One day after ABC announced that Stana Katic and Tamala Jones would not be returning for another season of Castle should the series get picked up for another season, Fillion posted a statement to Twitter wishing his now former co-star well. The statement comes as fans are stilling reel from the shock of learning that Katic ? one half of the show's central crime-fighting couple ? was let go, reportedly for budgetary reasons.