A sentence hearing for South African athlete Oscar Pistorius, who murdered his girlfriend Reeva Steenkamp, has started in the capital, Pretoria.

He faces a jail term of at least 15 years, but his sentence can be reduced due to time already spent in prison and mitigating factors.

A sentence is expected by Friday.

Pistorius, 29, killed Ms Steenkamp in February 2013 after firing four times through a locked toilet door.