Paralympian Oscar Pistorius reportedly looked at porn hours before he shot dead his girlfriend Reeva Steenkamp on Valentine's Day last year.

The 27-year-old has been charged with murder after the South African model was shot four times through a bathroom door in the double amputee's Pretoria home.

According to The Mirror, South African media have reported that Pistorius looked at porn and used car websites on his mobile phone, which was recovered at his home, hours before the shooting.

It has been claimed that an alleged court document says: "The accused's website activities from the time they were at home is in direct contrast to that of a loving couple spending time together."

South African media have also reported that the browsing history on the athlete's phone would be used as part of the State's case to prove that Pistorius is guilty of premeditated murder.

Pistorius, who will go on trial on March 3, denies murder by maintaining that he mistook Steenkamp for an intruder when the shots were fired.