[ "used to be" being the key phrase here, but still— there's a part of her that's not interested, that doesn't want to know anything about that good man. it's easier to hate him when all she sees is monstrous figure shrouded in darkness. ]
I don't know anything about who that good man was beyond the fact that he was once a Jedi Knight. [ maybe it might help to know more. maybe it would help her to understand and avoid succumbing to whatever caused a good person to fall so far. ] Perhaps you ought to start at the beginning.