TVWeek reports Katie Couric and CBS have reached a deal in principle for her to anchor "CBS Evening News" and an announcement was imminent.

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Couric would become the first woman to be the sole anchor of a major network newscast, the TV industry news magazine said on its Web site.

CBS has reportedly agreed to let NBC first announce Couric was leaving "Today" after 15 years, after which CBS will announce her new position behind Dan Rather's anchor desk, TVWeek.com said.

CBS, NBC and Couric's representatives all declined to comment on the report.

Couric's $65 million contract with NBC runs out in May.