Pauley Perrette — the resident goth of “NCIS” and a seemingly improbable fan favorite for about as long as this procedural has been on the air — is leaving the series. She announced her own departure via Twitter overnight, saying: “So it is true that I am leaving NCIS . . . ” and added, “there have been all kinds of false rumors as to why (NO I DON’T HAVE A SKIN CARE LINE . . . )”.

Then, in a follow-up tweet, she further elaborated, “It was a decision made last year. I hope everyone will love and enjoy EVERYTHING ABBY, not only for the rest of this season, but for everything she has given all of us for 16 years.”

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“Abby” of course is Abby Sciuto, her manic, death-obsessed, pigtail-wearing, dog-loving forensic scientist and quasi-daughter figure to “NCIS’s” all-wise paterfamilias, Leroy Jethro Gibbs (Mark Harmon).

With Perrette’s departure, only two original cast members will remain: Harmon and David McCallum. (Harmon, by the way, has also been subjected to a spate of internet-fueled departure rumors in recent months, although most major TV actors typically are subjected to those.) For those keeping count, all three have appeared on a total of 331 episodes of “NCIS” dating back to 2003.

Perrette, 48, is something of a polymath, with side-pursuits in music, writing, photography, filmmaking and charity (although apparently not skin care lines). As a veteran of TV’s most-viewed drama, she’s also well-remunerated: Forbes recently listed her as the 10th highest-paid ($8.5 million per annum) TV actress.

Her reference to “false rumors” dates back months, and although their genesis is unclear, she did provoke a few fans of this reddest of red-state series in January when she tweeted during the SAG Awards this: “Proud to be an actor tonight . . . though some of you think our jobs eliminate us from loving our country and having an opinion.” This followed a November tweet that read, “I LOVE AMERICA TOO MUCH. I didn’t know it was a country of bigots, I’m out.”

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Following the January fan pushback, she wrote in a longer post, “You think my thoughts don’t matter because I’m an actor? . . . You have been fooled by an illusion of excess. Trumps, Kardashians, yes, some celebrities, that money means more than your soul. But don’t blame me. I don’t believe in that . . . [expletive].”