Breaking: Pistorius applies to challenge murder conviction

South African Olympic athlete Oscar Pistorius has applied to the country's Constitutional Court to be allowed to overturn his murder conviction for shooting dead his girlfriend Reeva Steenkamp in 2013.

An appeal court changed his initial conviction for killing Ms Steenkamp from manslaughter to murder in November.

But his lawyers claim the court made fundamental errors.

Pistorius faces a minimum sentence of 15 years' imprisonment if he fails in his bid to overturn his conviction for murder.