In my opinion, there is no doubt that Oscar Pistorius committed murder and should have been convicted of it. He consistently admitted to shooting his girlfriend, the model Reeva Steenkamp adding that he believed her to be an intruder. However the intent to kill is murder no matter whose life he took.
Oscar Pistorius murdered this absolutely beautiful woman in cold blood. She was obviously scared and hiding in the bathroom after what appears to be some kind of confrontation with him. She was completely defenseless and he didn't care. He almost got away with it when he received such a minimal sentence but now justice has prevailed.
The lower court did not take into account if Oscar Pistorius was aware that his actions could likely result in a death in their original ruling. Shooting at someone through a door clearly indicates an attempt to kill, or at least an awareness of it as a possible result. This makes murder a more appropriate conviction.
It is not fair that Oscar Pistorius' manslaughter conviction was overturned and changed to a murder conviction because this is a violation of what is called "double jeopardy" in the United States. If the prosecution could not prove the defendant guilty during the original case, and the person is sentenced and released, then the prosecution should not have the chance to revoke that person's freedom. This could mean that a case could be brought to a judge and jury over and over again until they finally submit a guilty verdict.