Winfrey says she feels Frey "betrayed millions of readers"

CHICAGO – Oprah Winfrey challenged author James Frey over his disputed memoir, asking him on a live telecast of her show today to explain why he "felt the need to lie."

"It is difficult for me to talk to you because I really feel duped ... but more importantly I feel that you betrayed millions of readers," Winfrey said to Frey, who wrote the hugely popular "A Million Little Pieces."

Frey's story of substance abuse and recovery became one of the best-selling books of 2005 after Winfrey named it to her book club last fall, with countless addicts citing it as inspiration. It was originally published in 2003.