In an interview to be aired Friday on NBC's "Today," Cate Edwards said she believes her parents discussed the issue and decided it was time she knew about the affair with Rielle Hunter. Edwards fathered an illegitimate daughter with Hunter.
"He told me," she said. "I guess he and my mom decided that that was, you know, how it needed to be done. So yeah, I was devastated. And I was disappointed. I mean, these are my parents. I had grown up with a lot of love in my family. And it was hard to see them go through this."
Edwards, who represented North Carolina in the Senate for a single term, was the Democratic vice presidential candidate in 2004. His affair with Hunter began during his 2008 presidential campaign.
Cate Edwards, 31, is a lawyer. She is also involved with the Elizabeth Edwards Foundation, set up in memory of her mother to help poor children.
Elizabeth Edwards died of breast cancer in 2010. A year later her father was tried for breaking campaign finance laws and was acquitted on one count by a jury unable to agree on the other charges.
The interview was his daughter's first since the end of the trial.