To answer your last question: no. It's just as possible that she was attempting to kill him first, and her injuries were the result of him defending himself. What actually happened will be revealed in the investigation. Unless there are hard facts proving self defense on her part, and not just her word, we can't assume that's what happened.
One rule tought to me when I was going through forensic school (my dept cross trains some officers as forensic techs), always consider a death a homocide and treat it as such until the investigation reveals otherwise. Even the 90 year old man home alone who dies in his sleep is treated as a homocide until I can rule it out.
Pittsburgh Pirates- 1st place NL Central 7/15/11
They've got us surrounded? Good. Now we can fire in any direction, those bastards wont get away this time
An amateur will train until they get it right. A professional will train until they can't get it wrong.