Lara Macy was an NCIS agent and former major in the Military Police who for a time briefly headed the Office of Special Projects in Los Angeles in 2009 but following an assassination attempt on G. Callen's life, was reassigned elsewhere with Henrietta Lange later replacing her as OSP's Operational Manager.
Macy was later reassigned to France but was murdered some time prior to the episode, "Patriot Down" with the Major Case Response Team investigating the circumstances surrounding her death.
Prior to joining NCIS, Macy served in the United States Marine Corps, specifically with the military police. As a lieutenant who was stationed at Camp Pendleton, one of the cases that she investigated was the 1991 murder of a Mexican national and drug runner, Pedro Hernandez.
Macy collected the evidence, much of which pointed to Gibbs as the killer, but then buried it, because she considered the killing justified but not before making Gibbs relive the pain of his family's loss. Macy then spent the next two decades protecting Gibbs, something he did not learn until 2009.
Macy rose to the rank of Major before she left the military. After leaving, she then joined NCIS, eventually becoming the Special Agent in Charge of the Office of Special Projects in Los Angeles.
During her tenure at OSP, Macy coordinated a joint operation with elements of the Major Case Response Team in Washington D.C. to neutralize a terrorist cell within the United States. This operation brought her back into contact with Gibbs, who was now an NCIS agent as well and also the head of the Major Case Response Team in the Washington D.C. field office and as a result of the tensions between them, Gibbs even began believing that that Macy had botched the case against him twenty years ago to such an extent that Gibbs was even dismissive of Macy's ability to lead the team and also her skills as an NCIS Special Agent.
It was during this case that Macy confided in Nate Getz about what had happened back in 1991 with Gibbs and Hernandez.
A few hours after the case had ended, Nate later indirectly informed Gibbs as Gibbs and McGee were leaving OSP to return to Washington D.C. about what Macy had done for him, which affected a more stable and amicable relationship between them but a while later, one of Macy's senior field agents, G. Callen was the target of an assassination attempt that left him in critical condition.
As a result of the attempt on Callen's life, Director Leon Vance reassigned her to a task force in Marseille, France with Henrietta Lange later becoming the new Operations Manager for OSP on a permanent basis.
While stationed in France, Macy investigated the rape of Petty Officer Kaylen Burrows, who was stationed aboard the U.S.S. Majestic.
The case eventually led her back to Washington D.C., where she was murdered and her body was burned as part of a vendetta against Gibbs, specifically for her part in covering up the details of Hernandez's death.
Gibbs and his team were summoned to the scene and left devastated when Timothy McGee who Gibbs had brought with him to Los Angeles confirmed to them that the remains were those of Macy's.
As such, Gibbs became fixated on solving the crime by any means necessary and with the help of Medical Examiner, Donald Mallard and Forensic Scientist Abigail Sciuto later discovered that the knife marks on Macy's neck had come with a knife with the team determining that her killer was Jason Paul Dean, a disgraced former Army Ranger.
Shortly after her death, the room in her mother's house where Macy kept her old case notes was searched by parties involved with the Reynosa Cartel, who were looking for Macy's notes on the Hernandez case.
- Macy seems to share a few traits with former NCIS Agent Vivian Blackadder who appeared in the two pilot episodes for NCIS, Ice Queen (episode) and Meltdown (episode). They both appeared in the two-part pilot episodes for their respective series, NCIS and NCIS: Los Angeles, but they didn't make it to the main series; they also both had an extremely frosty relationship with Gibbs but while it was revealed that Macy had been brutally murdered by the Reynosa Cartel during Season 7, Blackadder's fate is still unknown.
- Macy was often called "Mace" by her NCIS colleagues.