CCTV footage has emerged of Reeva Steenkamp arriving at the home of Oscar Pistorius hours before her death.
Steenkamp is shown smiling as she drives into the luxury gated community where Pistorius lived.
The video was shown on South Africa's M-Net show Carte Blanche last night.
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The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.