South African Paralympic sprint star Oscar Pistorius said Friday he was consumed with "sorrow" as he marked one year since he shot dead his girlfriend on Valentine's Day in what he maintains was an accident.

He also posted a link to the message on Twitter, describing it as "A few words from my heart". It was the first time he has used his official account on the social networking site since February 12, 2013, two days before the shooting.

Steenkamp's relatives will gather on Friday in private to mark the anniversary of her death.

Steenkamp, a blonde cover girl and law graduate, was shot in the head, elbow and hip through the locked bathroom door of Pistorius's home.

Pistorius will also answer charges for discharging a firearm on two separate occasions before Steenkamp's death.

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