Well, he mentioned that Lana Sandoval and Ned Pennifold were along on the hunt. And that he was close enough to see what happened, but that no one was right there with him. He said there were 'a couple others' who saw it from a distance, but he didn't say who they were. I didn't think I should press too hard for further details, because I was afraid he would wonder why.

He was quite clear that it was Cadmus Mulciber who killed the muggle.