Video: Nathan Fillion on the ‘Late Show’ By Scotty GoreByScotty Gore February 18, 2011 11:30 PM Share SHARE (SoapOperaNetwork) — “Castle” star Nathan Fillion sets down with David Letterman to talk his time as Joey Buchanan on ABC’s “One Life to Live.” One Life to Live Late Show David Letterman Previous Article ‘OLTL’ March Casting Notes Next Article Next Week on General Hospital: Sonny and Brenda’s Wedding [PROMO]