What's interesting to me is that the assumption of the killer being AA doesn't come from any of the video shots - at least to my eyes. That speculation could only come from having a specific person in mind and making that assumption based on the race of their spouse.
I'm guessing, but others have said it, too.
Seriously, to me there's no way I'd guess that killer was anything other than very, very pale. I don't even see that makeup was used, plus it would be a lot of extra work trying to remove it in addition to the clothing. She must have been pretty sweaty, stressed and anxious at that point. Face makeup would leave traces on a balaclava, helmet, shirt, jacket, whatever got near it. Almost impossible to not contaminate any of the clothing.