Voldemort came very close to killing Bellatrix once. He found that, on a whim, he suddenly craved a child. He called upon Bellatrix and bestowed what he considered an honour on her. And though she tried - she could not fall pregnant. Voldemort was enraged and cast his wand in her direction, drawing breath. He had never been so angry. But seeing Bellatrix quivering there, not resisting, brave, even in death - he could not do it. So he swept himself out of the room and the only person - besides Harry - ever to escape Voldemort's wrath, walked free.
