South Africa's state prosecutor will seek a harsher prison sentence for jailed Paralympian Oscar Pistorius, arguing his six-year term for murder is too lenient. In 2015, Pistorius was found guilty of murdering his model girlfriend, Reeva Steenkamp. The South African double-amputee sprinter, known as the 'Blade Runner' for his futuristic prosthetics, maintains he believed Steenkamp to be an intruder when he shot her through the bathroom door. It is the second time the prosecution is appealing. Pistorius, now 30, was originally found guilty of culpable homicide, but this was changed to murder on appeal. The National Prosecuting Authority said in September that they had launched the appeal because the minimum sentence for murder is 15 years. They believe that the trial judge was too lenient in imposing a six-year sentence.