Seamus O'Grady is the secondary antagonist in the 2003 film, Charlie's Angels: Full Throttle.

He was portrayed by Justin Theroux who also later played the Evil DJ in Zoolander and Zoolander 2 and Leezar in Your Highness.

Seamus is the leader of the O'Grady crime family and Dylan's ex-boyfriend. He and Dylan used to date a long time ago, but one night, Dylan witnessed him shooting someone to death in a grocery store and testified against him in court, sending him to jail. Eight years later, Seamus escapes from prison and sets out to get revenge on Dylan. He confronts the Angels in the hangar and orders his troops to kill them, but the Angels fight them off and set fire to the hangar. Seamus survives, however, and is later seen at the theater where Jason's (Alex's boyfriend) movie premiere is taking place. He is revealed to be working for Madison Lee, the rogue Angel that the Angels had met earlier. In the final battle, Seamus prepares to burn Dylan with her lighter, but Dylan is prepared and kicks him off the building, sending him plummeting to his death.