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The incomparable Dr. Donald "Ducky" Mallard is the Chief Medical Examiner on NCIS.
Dr. Mallard is a Scottish-born doctor who has been long-time friends with team leader Gibbs, and underwent medical education at the University of Edinburgh.
He has a "second talent," as Gibbs calls it, to be able to read people, which he expands by studying psychology in his free time. Standard leisure activity.
In cases without actual bodies for Abby and Co. to work with, he assists by using his psychological training to decipher the clues left by the perpetrators.
Duck is an eccentric who often talks to the deceased while doing his job and rambles to his colleagues with many long, off-topic personal remembrances or historical accounts.
He's a kind man at heart, however.
He lived with his aging mother and their four corgis until she had to move out due to Alzheimer's.
Mallard drives a Morgan he restored himself. The ring tone on his phone features bagpipes playing "Scotland the Brave."