Kalil Hasan was a terrorist operative working for sub-cell leaders Navi Araz and Omar, and ultimately for their ringleader Habib Marwan. Kalil was responsible for setting up the stage and retaining security for the plan to execute James Heller; he was eventually discovered by Jack Bauer, who attempted to stall him by posing as an armed robber at a gas station. Hasan martyred himself when he realized he was being tracked.