Riley McCallister was a retired NCIS Special Agent & he was secretly, head of a conspiracy against NCIS Director Leon Vance.
In Amsterdam 1991; he meets Leon Vance & shortly afterwards, he secretly hires Anatoly Zhukov to kill Vance, but that plan fails when Eli David saves Vance and kills Anatoly's hit team. Riley later becomes head of the San Diego field office and in 1999, has Leroy Jethro Gibbs assassinate Anatoly in an overseas operation, while Jennifer Shepard is assigned to kill Svetlana Chernitskaya, but she couldn't do it. 9 years later, McCallister manipulates Svetlana to hire Viggo Drantyev & his gunmen to kill Retired NCIS Special Agent William Decker.
NCIS Season 8
In Enemies Domestic (episode), McCallister is revealed to have been responsible for the murder of Former NCIS Director Jennifer Shepard & the former mentor of Current NCIS Director Leon Vance. He wanted to be the Director of NCIS this whole time. After Former NCIS Director Thomas Morrow got reassigned to Homeland Security, he got Jenny Shepard out of the way (at the hands of Svetlana Chernitskaya & Viggo Drantyev), & he attempted to kill Leon Vance in his hospital bed by restraining the weakened director with his cane & fiddles with the morphine injector to give Leon a lethal dose. He mutters: "For once, can't you just die right?" Vance is about to die, but he has just enough awareness left to dig Gibbs's knife up under McCallister's rib cage & collapses seconds later. Leon struggles, but is still able to call his nurse. The nurse enters & immediately tends to McCallister, who has died from his injuries.
NCIS Season 9
His spirit appears in Life Before His Eyes (episode).
- 2010: The following were involved in the hotel bombing:
- 1991: Leon Vance- (Hired Anatoly Zukov to kill him, but failed).
- 1999: The following were targets of the second assassination operation:
- Anatoly Zhukov- (Shot at point blank range by Retired NCIS Special Agent Leroy Jethro Gibbs, who didn't know that he was covering McCallister's attempt to kill Vance).
- Svetlana Chernitskaya- (Was targeted to die, but Jenny could not kill her. Later shot at point blank range from behind by Former NIS Special Agent Mike Franks to avenge Jenny's death).
- 2008: William Decker - (Having been involved in the 1999 operation alongside Gibbs & Jenny Shepard, Decker was hunted down by Svetlana Chernitskaya's thugs & tortured for information after McCallister gave Svetlana his name. When he failed to provide, he was murdered; his cause of death was registered as a heart attack, but Jenny, Gibbs & Mike Franks knew the truth).
- 2008: Jennifer Shepard - (Killed in a gunfire fight in a Diner; McCallister wanted Jenny's job as N.C.I.S. Director, but in order to hide his involvement in her death, he used Svetlana Chernitskaya's past association with Jenny as a cover; her & Viggo Drantyev were both hired by McCallister to take Jenny out.