'NCIS' Stars Explain the Reason Why They Left The Show (Including Boredom & an On-Set Feud)

NCIS is currently in its 20th season, and has seen many stars come and go since the start. With fans curious about if David McCallum‘s (aka Dr. Donald “Ducky” Mallard) will keep appearing on the series in a limited capacity, Just Jared did a deep dive into finding out why each of the original stars,