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Hannil Rostoff was G. Callen's former foster sister who prior to her death was studying John Cole/ Ethan Stanhope from a distance.
While in a rented apartment, Hannil was gunned down by Stanhope's bodyguard, Max Tyrus and her death prompted the Office of Special Projects to be dispatched to investigate where it was discovered that her death was connected to Callen's near-fatal shooting that had happened several months ago.