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?
Use the video above to watch NCIS online right here via TV Fanatic.
Get up to speed on all of the action right now.
Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.