"You can't know, actually." She replied, seeming sympathetic. "But listen to your conscience and ask yourself, what else could there be? It's not useful to investigate a dead person's past. You'll only bring pain and misunderstanding to the surface. Your only target should be the Death Eater. I know you're good enough to find him. Give him to the Aurors and close your wounds. Trust me, you don't need anything else to go on."