Steenkamp main guest speaker at a dinner in Auckland next month for charity Shine.

The mother of slain model Reeva Steenkamp, shot dead by South African bladerunner Oscar Pistorius on Valentine's Day 2013, is due to share her daughter's story while visiting New Zealand.

June Steenkamp, who lost her 29-year-old daughter two years ago, has been confirmed as the main guest speaker at a formal dinner in Auckland next month for the 25th anniversary of domestic abuse prevention service charity Shine.

Pistorius, a 28-year-old double amputee, was found guilty of culpable homicide - similar to manslaughter - over Reeva Steenkamp's death in October.

The athlete, who competed for South Africa at the London Olympic Games and Paralympic Games, is serving a five-year prison sentence.

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June Steenkamp said she never believed claims made by Pistorius that he shot at her daughter through a closed bathroom door because he thought she was a burglar. "I don't believe it at all," June Steenkamp told the Guardian.

"She [Reeva] told me they were fighting a lot. She'd only known him a short time and was beginning to think they were incompatible, and I think that night she was going to leave," she said.

"They had a fight, something went horribly wrong. I don't know what it was; I can't possibly know. Only Oscar knows, and Reeva knows, and she's not here any more. But there's a missing piece. This is not the whole story. I just wish he could have stood up and said exactly what happened." After Pistorius' sentencing, June Steenkamp published a book, titled Reeva: A Mother's Story.

Shine said the black-tie dinner on March 28 at the Heritage Hotel was the only planned public speaking engagement in New Zealand for June Steenkamp.

The fundraising dinner is being hosted by radio personality and writer Kerre McIvor.

To buy tickets to the event, click here.