In the episode, “The Tie That Binds," after the NCIS team tracks evidence from the murder of a Navy captain to Ducky’s deceased mother, Ducky looks back and questions a pivotal life choice he made 37 years ago. Also, the team exchanges holiday gifts, and Gibbs spends Christmas dinner with Fornell.
Shaughnessy is playing with role of Balthazar Kilmeany. Former Harper's Island star Adam Campbell also appears, returning as Young Ducky.
NCIS airs Tuesday at 8 p.m. ET/PT on CBS.
Shaughnessy has never been nominated for a Daytime Emmy Award for his work on Days, but did win in 2002 as "Outstanding Performer in an Animated Program" for playing Dennis in Playhouse Disney's Stanley.