Diona Reasonover’s Kasie Hines was introduced in NCIS Season 15 as the graduate student whom the late Donald “Ducky” Mallard hired his assistant while he was writing his book.
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Then when Pauley Perrette left the CBS series, Reasonover was upgraded from recurring player to series regular, with Kasie taking over Abby Sciuto’s position as Forensic Specialist.
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She’s remained in that position ever since, and ahead of NCIS Season 22 concluding its run on the 2025 TV schedule, Reasonover gave a thoughtful answer to CinemaBlend about feeling “ownership” over playing Kasie in those early years.