Oscar Pistorius was allegedly surfing porn websites on his mobile phone the night he shot model girlfriend Reeva Steenkamp in his Pretoria home.
A leaked document believed to be part of the court investigation reportedly alleges the athlete was surfing pornographic material on his mobile while Steenkamp was in the house on Valentine's Day in direct contrast to "a loving couple spending their time together".
The new allegation comes only days after leaked documents filed by prosecutors in South Africa claimed Pistorius told concerned security outside his home that everything was "fine" after the shooting last year.
Prosecution documents also revealed Pistorius was "most likely on his stumps" and fired at the bathroom door where Steenkamp was shot dead from a greater distance than the 60cm initially reported by police.
These contradict earlier claims that Pistorius, 27, took the time to put on his prosthetic legs, suggesting that he did not panic about the prospect of an intruder breaking into his gated community villa. The athlete said he shot her in a case of mistaken identity.