NCIS: Los Angeles' Sam Hanna will take a bullet doing what he does best - protecting people.

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The former Navy SEAL will find a hot piece of lead in his chest during "Expiration Date," and Callen (Chris O'Donnell) will have a sniper to blame for his partner's sudden tenuous hold on life. Two new sneak peeks for Monday's episode lay out the dire situation.

The Office of Special Projects will seek to apprehend a spy (Parminder Nagra) during "Expiration Date," but the situation will get out of hand when Thapa (Ernie Reyes Jr), the gurkha from season 5's "Frozen Lake," will attempt the same. As the Callen and Sam (LL Cool J) attempt to persuade Thapa to let the young woman go, a new party will enter the fight as a sniper move to take down Nagra's character.

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Using his body as a shield, Sam will soon find himself in a puddle of blood on the warehouse floor.

Don't worry, however. Hetty's isn't about to let one of her agents go down without a fight. A phone call later, Sam will be in surgery with the best doctor Mrs. Lang can muster.

So who was the sniper? Fans will have to wait until NCIS: LA airs Mondays at 10 p.m. ET on CBS to find out.