Sean Kirby was a surgeon for the crime lord Ethan Stewart.
In 2503, Kirby found himself operating on his employer, treating him for gunshot wounds. However, the surgery was left incomplete, the zerg invading the complex and Dead Man's Rock as a whole. Oddly enough, they seemed intent on retrieving Stewart rather than harming those tending to him. After doing so however, they reverted to their instincts, killing Kirby and his co-workers.
Golden, Christie (November 27, 2007). StarCraft: The Dark Templar Saga #2: Shadow Hunters. Simon & Schuster (Pocket Star). ISBN 0-7434-7126-1