Oscar Pistorius trial: 'The moment everything changed'

Oscar Pistorius has begun to describe "the moment everything changed", when he shot girlfriend Reeva Steenkamp dead in the early hours of 14 February 2013.

The athlete told his murder trial in Pretoria he heard noises in the night, and fearing his house was being burgled fetched his gun to confront the intruders.

The prosecution argues the shooting was premeditated, which Mr Pistorius denies.