Kyle Hendricks was a marine wannabe-turned-serial-killer who appeared in One Shot, One Kill (episode).
Kyle applied to the U.S Marine Corps and went to the Rockville Recruitment Center on August 11th 2002 with his stated goal as wanting to be a Marine sniper. He was rejected when a personality profile assessment revealed that he had sociopathic tendencies with anti-social behavior.
After having gained remarkable sniping skills, likely through self-training, he began killing Marine recruitment officers in and around the Washington D.C, starting with Gunnery Sergeant Freddy Alvarez, which he shot with a 7,62 sniper rifle from ca 600 yards.
The NCIS Major Case Response Team led by NCIS Special Agent Leroy Jethro Gibbs, himself a former Marine sniper were called in and began investigating the murder. When Hendricks killed again, murdering Staff Sergeant Allen, the FBI led by Agent Freedman were summoned to the scene, bringing them into conflict with NCIS.
Just as they were leaving the scene, Gibbs noticed a white feather left as a calling card was found in the recruitment center and realized that Hendricks was inspired by Carlos Hathcock, a real-life Vietnam veteran who wore a white feather in combat.
The team then set up an undercover operation, having Gibbs pretend to be a recruiter, Caitlin Todd his C.O., and Anthony DiNozzo a cable worker, in order to look for a potential serial sniper among the visitors.
They found one, but changed their minds when they realized that Hendricks had already left a feather on the scene when dressed as a water deliverer.
Hendricks soon took a shot at Gibbs, unaware that the office glass had actually been replaced with bulletproof glass which meant that shot was useless. The sound of the shot was what the team had been waiting for, since it allowed the triangulation of the point of origin.
Tony drove to arrest him, at the same time as the FBI. Feeling cornered, Hendricks committed "suicide by cop" by raising his gun towards Tony, who was forced to shoot him.
Much to DiNozzo's dismay, the FBI took the credit of stopping Kyle Hendricks while Gibbs even later admitted Hendricks was an impressive marksman.