Rachael Sparks

Rachael Sparks is the main villainess from "Code of Conduct," episode 7.05 of NCIS.

She was played by Brooke Nevin.

Rachael Sparks is the 20-year-old stepdaughter of Sara and James Korby, as her parents had both passed on (her father, a Marine, was killed in the line of duty). Rachael was also the beneficiary of a $200,000 trust fund left to her by her deceased father, but it was in Sara's control until Rachael's 25th birthday. Not wanting to wait five years to get what she believed was hers, Rachael devised a plan to kill James, which included leaving a party one night and slipped James a thermos of cocoa poisoned with liquid nitrogen, which James drank and later succumbed to the poison. The villainess also set up the murder to look like a suicide, as she bought a hose and duct tape and placed the former in James' car with the victim inside and the engine running. As revealed later on, the evil Rachael bought the objects with Sara's credit card, doing so in an attempt to frame her stepmother for the murder.

With Sara locked away, Rachael could get her trust fund sooner, and would also inherit $250,000 from James' insurance policy. However, Rachael's villainous role was uncovered when Gibbs and DiNozzo confronted her, with the former finding the discarded thermos with Rachael's prints. After originally denying her role, Rachael later confessed, saying that five years was an eternity to wait. She also chastised James for his penchant for pulling Halloween pranks, and claimed that Sara used her biological father and threw herself at anyone in a uniform. DiNozzo handcuffed and arrested Rachael, who expressed her concern over her trust fund and inheritance.