Watch NCIS Online: Season 15 Episode 18

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Who was murdered in the NCIS headquarters?

That was the big question on NCIS Season 15 Episode 18 when the team were evacuated after a body was found on the roof of the squad room.

After some investigating, it was revealed that bomb materials were on the victim, and the team wondered whether a face from the past could have been planning an attack. 

However, one thing led to another, and a suspect was hauled in for questioning. 

Who was it?

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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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NCIS Season 15 Episode 18 Quotes

Bishop: So our intruder accidentally killed himself--
Abby: --with a pipe bomb--
Bishop: --on the roof of NCIS headquarters.

Jimmy: I mean, I guess I can see how some lawyer could use the confusion of an evacuation to call into question the chain of evidence, but, well, Autopsy *and* Abby’s lab have secure storage. These new rules clearly are written by some out-of-touch bean counter!
Bishop: I helped write the protocol when I was at NSA.
Jimmy: You used the words “evacuation” and “evidence” twice in the same sentence.