Clara Harris speaking with Oprah

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For the past two years, Clara has been locked up in maximum security at the Mountain View Correctional Center in Gatesville, Texas. Oprah visited her in the prison for a one-on-one discussion.

First, how did Clara learn about the affair? She says that Diana, a woman who worked at the dental office, informed her, but Clara couldn't believe what she was hearing. "I thought she was trying to destroy my marriage," Clara says. She says she was still in denial when she talked to her husband afterward, but David admitted that he had been seeing his receptionist, Gail. But he insisted that he had done no more than kiss her hand, and he declared that he would do anything to save their marriage. "I said, 'Okay,'" Clara recalls. "'I want you to fire her today. I want us to go to marriage counseling. I want you to tell your parents. And I want you to tell the pastor.'"

Clara says after their discussion she went downstairs, angry and confused. David's 16-year-old daughter from a previous marriage, Lindsay, was sitting in the kitchen. "I told her, 'There is something you need to know about your dad,'" Clara remembers. "And she said, 'I know already.' … She said, 'All the girls in the office know.' She told me [David and Gail] go for lunch everyday. And so this was more news than what he had just told me."