Castle (2009)

Bad Santa

Aired Dec 8, 2014 · 9:00 PM ET · 45 min

When an ER physician is gunned down in the street, Castle and Beckett soon discover that the victim was a mob doctor to a Mafia family run by an old friend of Castle's. Also, against this backdrop of Christmas, Esposito and Lanie reach a defining moment in their relationship.