STELLENBOSCH, South Africa (AP) — Oscar Pistorius could still face a murder conviction and 15 years in prison for killing his girlfriend as prosecutors said Friday they had consulted a South African criminal law expert over an appeal. Chief prosecutor Gerrie Nel has talked to Prof. James Grant, a criminal law specialist at Johannesburg's University of the Witwatersrand, prosecution spokesman Nathi Mncube confirmed to The Associated Press. Pistorius started serving a five-year prison sentence on Tuesday after he was acquitted of murder by a judge and found guilty of a lesser charge of culpable homicide, or manslaughter, for shooting Reeva Steenkamp through a toilet door.