• Actor LL Cool J plays NCIS Special Agent Sam Hanna in 'NCIS: LA'

Actor LL Cool J plays NCIS Special Agent Sam Hanna in 'NCIS: LA' (Photo : REUTERS/Mario Anzuoni)

This week on "NCIS Los Angeles" Season 6, Episode 18 (CBS air date: 3/23/15) - Kensi and Deeks get suspicious of a photographer while they are working out and flirting with each other at the park. Titled "Fighting Shadows," this week's new episode has more on Kensi, Deeks and Hetty.

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Spoiler alert: This update contains "NCIS Los Angeles" spoilers.  Read on at your own risk. Kensi Blye (Daniela Ruah) and Marty Deeks (Eric Christian Olsen) are expected to take the spotlight in Season 6, Episode 18. However, they will not be each other's partner.

An explosion claims the lives of three FBI agents in this week's new episode, "NCIS Los Angeles" Season 6, Episode 18. Hetty (Linda Hunt) assigns Kensi with Sam (LL COOL J), and Deeks with Callen (Chris O'Donnell) in a curious move. The couple takes this move as a sign Hetty knows about their intimate relationship.

In a CBS promo clip for "NCIS Los Angeles" Season 6, Episode 18, Kensi and Deeks are exchanging sex jokes, playful and almost carefree during a workout session at the park. All is well until Kensi spots a photographer, snapping images in their direction.

Another CBS promo clip of "NCIS Los Angeles" is highlighting the intensity of this week's new episode. Somebody wants revenge, and this is just the beginning, says Hetty. An attack in the morning will have follow-ups, the NCIS LA team is warned. There are risks involving Deeks that would be explored, too.

This week's new "NCIS Los Angeles" Season 6 episode was written by Andrew Bartels and directed by Tony Wharmby. The next episode, "Blaze of Glory," will air on Mar. 30.