Quote Originally Posted by The Man
And here I am, chiming in with the obligatory note that it was not in fact Sephiroth who killed Aeris at all, since he was currently encased in materia in the Northern Crater. Most likely, it was the shapeshifter Jenova, who chose to assume the form she knew would most strongly resonate with Cloud, although there are indeed alternate theories about who, exactly, it is that is responsible for Aeris' death.
thats right Jenova-Death says something to the effect of her being Sephiroth's body the whole time he was just the dude holding the game controler only he was incased in materia and couldnt move so that shoots the game controler idea