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Source: CBS

We Still Miss Abby on 'NCIS' — Here's Why Our Favorite Chief Forensic Scientist Left

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Since 2003, when it rebooted as a spinoff of JAG, NCIS has amassed quite the avid fanbase. In fact, the 2014 "most watched drama in the world" has been so successful over the past decade that the show got franchised in New Orleans and Los Angeles.

Unsurprisingly, with such a big endeavor comes a rotating cast and crew. And while Mark Harmon's Leroy Gibbs has been carrying viewers steadily through the past 16 seasons, many fans are wondering why other OG cast members didn't last as long.

Namely, why did Abby leave NCIS after Season 15? In anticipation of the NCIS mid-season finale, let's take a stroll down memory lane.

So, when did Abby leave NCIS?