• Cast members (L-R) Michael Weatherly, Pauley Perrette, Rocky Carroll, Mark Harmon, Cote de Pablo and David McCallum participate in a panel for CBS series NCIS during the CBS sessions at the Television Critics Association winter press tour in Pasadena, Cal

Cast members (L-R) Michael Weatherly, Pauley Perrette, Rocky Carroll, Mark Harmon, Cote de Pablo and David McCallum participate in a panel for CBS series NCIS during the CBS sessions at the Television Critics Association winter press tour in Pasadena, Cal (Photo : REUTERS/Phil McCarten )

"NCIS" Season 12 returns with another action-packed episode that unveils some long-buried secrets in the Episode 19 airing on March 31, 2015. The upcoming segment is titled "Patience" and will focus on the murder case of a petty officer that leads the investigators to an old bombing attack. Here are few spoilers for the next episode of "NCIS" Season 12. Read on to find out what happens next.

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[Spoilers alert! Read at your own risk.]

The last-aired episode of "NCIS" Season 12 revolved around a thief's murder at a Marine's home. At the same time, the show delved deeper into Timothy McGee and his girlfriend Delilah Fielding's relationship.

Moving on to the next episode, CBS has released synopsis for "NCIS" Season 12 Episode 19. According to the network's synopsis (via Spoiler TV), a petty officer is found dead and Leroy Jethro Gibbs and Anthony DiNozzo are determined to find the killer of the navy man. However, the case takes an unanticipated twist when Gibbs and DiNozzo find a lead that works as a clue for bombing attack that occurred at United States airport forty years ago.

Gibbs and DiNozzo have been working on the cold case for the past two years but never found a lead as strong as this one. Are these two cases connected? Meanwhile, McGee experiences feelings of jealousy as he learns DiNozzo and Gibbs have been working on the bombing case in clandestine manner. McGee had not idea about the case and is not very happy with DiNozzo and Gibbs.

The abovementioned TV show news website has also published promotional photos for "Patience." Fans can take a glimpse of photos for "NCIS" Season 12 Episode 19 by clicking here.

A promo video (as published on YouTube.com/TVBox Promos) for Episode 19 teases some fun moments in the upcoming segments as Tony and Bishop are forced to witness couples counseling class. Things are definitely going to get awkward and bit strange for the agents. Scroll down to watch the video.

"NCIS" Season 12 Episode 19 "Patience" airs March 31, 2015 at 8:00 pm on CBS. Stay tune for more spoilers.