GETTY Oscar Pistorius murdered his girlfriend in 2013

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The six-time Paralympic gold medallist told the court he used a cricket bat to smash down the toilet door after shooting his girlfriend – who he believed was an intruder. But a new report suggests the bat may have been used before the shots were fired at the model after experts analysed bruising on her back.

GETTY Fresh evidence has claimed he beat Ms Steenkamp with a cricket bat

Forensic expert brothers Calvin and Thomas Mollett carried out their own tests for a new book which covers the case, named Oscar vs The Truth. They also claim an argument broke out between the couple and lasted for more than an hour before Pistorius killed his girlfriend. According to the Daily Maverick, they wrote: “Oscar went after her with a cricket bat – infuriated that she locked herself away from him – and to scare and frighten her, he hit the door with the cricket bat about two to three times and also hit the steel plate against the bathtub wall.”

GETTY He will be sentence for murder in June this year

In 2013 the 29-year-old claimed he killed Reeva after mistaking her for an intruder and was convicted of culpable homicide – the South African equivalent to manslaughter. But the conviction was overturned last December and he was found guilty of murder and will be sentenced in June this year. The brothers claim that the alleged wounds made by the bat were overlooked by the pathologist who they suggest failed to take the full account of the altercation.

This damage was caused by some very robust handling of the bat Calvin and Thomas Mollett

They add: “This damage was caused by some very robust handling of the bat.” The experts also suggest an argument was heard by neighbour Estelle van der Merwe before the tragic events unfolded.

GETTY The six-time Paralympic gold medalist ran in the London 2012 Olympics