Castle star Nathan Fillion stopped by LIVE! With Kelly on Friday, May 4, 2012. After schooling Kelly Ripa on some standard Canadian lingo, he dished on reuniting with his former Firefly co-star Adam Baldwin and what it was like dressing up on as Elvis in Episode 8: "Heartbreak Hotel."
Warning: This interview contains a sneak peek clip from Castle's Season 4 finale, airing on Monday, May 7, 2012 at 10 p.m. ET on ABC.
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