BOSTON -- Scott Peterson's former mistress is out with an explosive new tell-all book, and Wednesday on "Oprah," Amber Frye shared her emotional story of how she was deceived.

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Mary Saladna Reports On Frey

NewsCenter 5's Amalia Barreda reported that in an emotional sit-down with Oprah, Frey admitted it's still hard to look at Peterson.

"I become very emotional," she said.

In her book, Frey tells how she was introduced to Peterson by a girlfriend and how she quickly fell for him.

"I thought he was handsome. I was impressed. I'm thinking he's an ambitious young man with a lot of potential," Frey said.

She also said how she quickly came to trust Peterson -- to the point of allowing him to pick up her daughter at school after the third date.

Once Frey's best friend found out that Peterson was married, she confronted him. But he told Frey that he had been married, but his wife passed away. She believed him.

Frey went to explain how she eventually learned about Lacy Peterson and that she was missing, and how Frey agreed to turn state's witness against Peterson.

Frey said that on the day Peterson was arrested, he was carrying a cache of weapons, $15,000 and a map to Frey's office.