June Steenkamp was quoted by the Times newspaper in South Africa in a front page interview Monday asking: "Why my little girl? ... Why did he do this?"
She says of late daughter Reeva, a model, law graduate and Pistorius' girlfriend, "she loved like no one else could love" and "just like that, she is gone."
Double-amputee athlete Pistorius, an icon in South Africa and a star of last year's Olympics, remains in custody in a Pretoria police station charged with Steenkamp's murder after she was shot multiple times inside his home.
He will reappear in court Tuesday, the same day as Steenkamp's private funeral in her hometown.