South African paralympic gold medallist Oscar Pistorius will be sentenced on July 6 for the murder of his girlfriend Reeva Steenkamp in 2013.
The double-amputee's manslaughter conviction was overturned last year by an appeals court, which convicted Pistorius of the more serious charge of murder.
Barry Steenkamp has told a court he and his wife June forgive Oscar Pistorius for killing his daughter, but he must pay for his crime.
Mr Steenkamp added that he would like to talk to Pistorius one day.
"June (Reeva's mother) is a Christian, so am I but I don't really go to church. June has forgiven. She feels it's right in her heart to forgive Oscar," he said.
"But...forgiving like that, it still does not exonerate you from the crime that you committed. He has to pay for that.
"It's been very difficult for me to forgive. But I feel the same, that Oscar has to pay for what he did. He has to pay for it. And that's all I can say.
"Most probably the time will come when I want to talk to Oscar, in private, not now, at a later stage, I would like to talk to him, yes."
The cousin of Reeva Steenkamp has told Oscar Pistorius' sentencing trial that she didn't believe Reeva loved Oscar.
Carl Pistorius has broken his family's silence in an interview with ITV News.
The disgraced athlete should learn his fate by the end of the week - ending years of legal twists and turns.