Seamus O'Rourke

Seamus O'Rourke is the main antagonist in Ronin.

Biography
Seamus is an Irish terrorist and a boss to an IRA operative named Deirdre. Seamus' goal is to acquire a large metallic case that is being held by a heavily armed convoy and sell it, and he makes Deidre hire a group of mercenaries to steal the case for him. As the mercenary group chase after the men holding the case and a fierce gunfights erupts, one of the group members, named Gregor, betrays the other men by leaving them with a fake case that is rigged to explode. One of the other mercenaries, named Sam, gives chase but Gregor escapes, only to be captured and kidnapped by Seamus. He, Gregor and Deirdre escape in a car and return to one of Seamus' safe houses, where he beats up Gregor for information on where the real case is being contained. Because of that, he said he was not going to kill Gregor.

Gregor leads Seamus and Deirdre to a post office where he finally obtains the case, but then is pursued by Sam and Vincent in a Navy Blue Peugeot 406. After a car chase, Deirdre crashes her BMW after a tire got shot by Vincent though she and Seamus are rescued by a group of bystanders before the car explodes (while Gregor flees). Sam and Vincent track down Gregor once again, leading them to a large arena where Gregor is making a deal with a Russian mafioso, Mikhi. Before Sam arrives, Mikhi shoots Gregor in the forehead and takes the case from him. Outside the arena, Seamus appears and kills Mikhi before stealing the case back from him. Deirdre flees away in a Security car, then the police arrives on scene and the guy with a newspaper sitting as a passanger in a undercover cop car also arrives. A Security guard tells him to come over here, but Seamus wounds Vincent and Sam comes after him. Seamus is later killed by Vincent, saving Sam's life.

Trivia

 * Seamus is (mostly) wanted by the police in the movie.