Sarah - thank you so much for posting that. Also got to love the avatar
The fact that the killer used an instrument to penetrate the victim is horribly distasteful of course but as a non-professional I just don't see it as evidence of the killer being a female. It's
possible of course but it's surely at least as possible that the killer harbored feelings of rage and inadequacy that prevented him from carrying out a penile penetration, or perhaps he was just a sick [insert expletive of choice] who liked that kind of thing.