Former Aurors.
Do we have any ideas about who might have done it? I'm assuming it has to be one of their worst, probably an already known and experienced Death Eater like the Lestranges, Avery, Mulciber, someone of that caliber. I was wondering if any of you might have seen a tactic that could be revealing, though? I know Gawain was concerned with tracking this information, and I think we probably all want to see his murderers brought to justice one day.