Reeva Steenkamp's family is mourning the loss of the former model who was shot to death in the home of her boyfriend, Olympic athlete Oscar Pistorius. Tonight Steenkamp's brother, Adam, reflects on his sister's life and talks about what he and other relatives knew about the type of relationship she had with Pistorius.

"She wanted to make a difference," he tells CNN's Jake Tapper. "She started by making small steps in that right direction." Steenkamp says Reeva, who graduated from law school, wanted to help with the issue of violence against women in South Africa.

Pistorius became an inspirational figure for overcoming his disability and achieving record success as a Paralympic competitor. In the affidavit read by his lawyer in court, Pistorius claims he thought Steenkamp was an intruder and never meant to harm her. The charges against him were upgraded to premeditated murder this week.

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