Pictured: Chris O'Donnell (Special Agent G. Callen), LL COOL J (Special Agent Sam Hanna) and Danny Trejo (Tuhon). Sam and Callen head to Mexico to search for Tuhon, a retired assassin they encountered on their very first case together, now a suspect in the murder of a diplomat. Meanwhile, Nate and Deeks stay in Los Angeles to assist with the investigation, on NCIS: LOS ANGELES, Tuesday, Feb. 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Peter Cambor Returns as Operational Psychologist Nate Getz and Danny Trejo Guest Stars as Tuhon. Photo: Neil Jacobs/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.