Despite the fact that many characters have left “NCIS” over the course of its two decades on the air, there have been plenty of supporting characters who have maintained their presence on the show. One such character is Delilah Fielding, who has been a consistent presence on "NCIS" since 2013, but who is the actor behind Delilah Fielding on "NCIS?"

Actress Margo Harshman portrays Delilah and has appeared in a total of 17 episodes of the beloved military procedural drama. Harshman is an actress with numerous on-screen credits to her name, showing up across a wide range of film and television projects in many different genres.

Harshman's most notable projects to date are a four-episode arc on "The Big Bang Theory," slasher remake "Sorority Row," cheerleading comedy "Fired Up!" and her recurring role as Tawny Dean on the hit Disney Channel series "Even Stevens." Beyond those roles, Harshman has also appeared in "Without a Trace," "Everwood," and "Grey's Anatomy."