We know all of that .. but what we are saying is that this was never just a freak accident, say for instance she was out in the garden with him, doing a bit of work on the garden cutting down a branch of a tree or something and that branch happened to fall and hit her on the head and kill her. It's not that kind of accident .. in this instance, OP, deliberately and intentionally killed someone, and that someone turned out to be Reeva (whether he knew it at the time or not!). There is no possibility of innocence, because the law does not allow a person to shoot a target behind a closed door and without establishing who your target is, first .. OP failed to do that, and he failed to ensure that it wasn't his girlfriend behind that door (either that or he knew it was her, and intended to kill her .. but neither of those scenarios will ever mean that he is innocent).