VIDEO: Sneak Peek - Tonight's Episode of CBS's NCIS: LA

On tonight's episode of the CBS drama NCIS: LOS ANGELES entitled 'Paper Soldiers,' a distraught widow is suspicious of the circumstances surrounding her Marine husband's last battle and Sam and Callen help to determine if there has been a cover-up.

Meanwhile, Hetty summons Operational Psychologist Nate Getz to be her "pawn" and the rest of the NCIS: LA team sense another evaluation on the horizon.

The episode airs tonight, Tuesday, Jan. 15 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Peter Cambor, a former series regular from the first season, returns to NCIS: LOS ANGELES to guest star as Operational Psychologist Nate Getz.