After three decades of keeping mum, Barbara Walters is disclosing a past affair with married U.S. Senator Edward Brooke, whom she remembers as “exciting” and “brilliant.”

Appearing on “The Oprah Winfrey Show” scheduled to air Tuesday, Walters shares details of her relationship with Brooke that lasted several years in the 1970s, according to a transcript of the show provided to The Associated Press.