In the Line of Duty is the 13th episode of NCIS: Los Angeles Season 6 as well as the 133rd episode of the entire NCIS: Los Angeles series.
When the U.S. Consulate in Sfax, Tunisia is attacked, Callen and Sam head to the crime scene to investigate the deaths of two officers, one of whom was a close friend of Sam's with the two agents soon discovering that the U.S. Ambassador may not be the intended target of the attackers after all.
- Julie Chen (Nancy Kelly) is credited as a Special Guest Star.
|G. Callen||Chris O'Donnell||NCIS Special Agent and the leader of the Office of Special Projects field team.|
|Kensi Blye||Daniela Ruah||NCIS Special Agent with the Office of Special Projects.|
|Marty Deeks||Eric Christian Olsen||A Detective with the Los Angeles Police Department and also the LAPD/NCIS liaison.|
|Eric Beale||Barrett Foa||Tech Operator with the Office of Special Projects.|
|Nell Jones||Renée Felice Smith||Tech Analyst for the Office of Special Projects.|
|Owen Granger||Miguel Ferrer||NCIS Assistant Director.|
|Henrietta Lange||Linda Hunt||Operations Manager with the Office of Special Projects.|
|Sam Hanna||LL Cool J||A former Navy SEAL-turned-NCIS Special Agent with the Office of Special Projects.|
|Vince Jones||Geoff Brown||Special Agent.|
|Nancy Kelly||Julie Chen||Ambassador to the U.S. Consulate in Sfax, Tunisia.|
|Alan Beck||Don Franklin||Captain in the United States Navy.|
|Brad Reese||Joe Nieves||Special Agent with the FBI.|
|Munir Al Zarzi||Maz Siam||Terrorist.|
|Walter||Paul Tassone||Officer with the CIA.|
|Tom Harris||Jay Pickett||Commander in the United States Navy and the Military Attaché to the U.S. Consulate in Sfax, Tunisia.|
|Ray (In the Line of Duty)||Delpaneaux Wills||Security Detail Leader.|
|Clayton Waters||Neil Arnote||Security Detail Member.|
|Female Receptionist (In the Line of Duty)||Tory Berner||Uncredited role.|
|FBI SWAT Team Leader||Tim Clemente||Uncredited role.|