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Pretoria, South Africa (CNN) -- Oscar Pistorius, the global sports hero known as the "Blade Runner," will appear in court Tuesday seeking bail as authorities accuse him of murdering his girlfriend.

South African prosecutors have said they intend to upgrade the charge to premeditated murder, but have not released further details.

The last time the world saw images of Pistorius, the track star was sobbing during a court hearing Friday, crumbling as he heard that heavy, hideous word: murder.

It's a far cry from the packed stadiums that erupted in applause for the double-amputee who dared to compete against men with legs.

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Authorities have released little about a possible motive in the Valentine's Day shooting, while local media have reported that Pistorius had mistaken his girlfriend, Reeva Steenkamp, for an intruder.

South African authorities have stressed that the scenario did not come from them, and said there was no evidence of forced entry at the home.

Steenkamp was shot four times through a bathroom door in Pistorius' upscale Pretoria home, a South African official familiar with a case said Monday.

The 29-year-old model was alive after she was shot and Pistorius carried her downstairs, said the official, who was not authorized to release details to the media.

Detectives are investigating a blood-stained cricket bat in the home, Johannesburg's City Press newspaper reported, and are trying to determine whether it was used to attack Steenkamp, if she used the bat in self-defense, or if Pistorius used it to try to break down the bathroom door.

Pistorius, 26, has rejected the murder allegation "in the strongest terms," his agent said in a statement.

Meanwhile, friends and family will mourn Steenkamp at a private funeral service in her hometown of Port Elizabeth.

On Sunday, South Africans heard Steenkamp's voice one last time after her death, when the national broadcaster aired a pre-recorded reality TV show featuring the model discussing her exit from "Tropika Island of Treasure," on which local celebrities compete for prize money.

"I'm going to miss you all so much and I love you very, very much," she said, blowing a kiss to the camera.

CNN's Robyn Curnow reported from South Africa; Holly Yan reported and wrote from Atlanta.