Amber Clayton floats down 'Rivers'

Actress cast as regular in new CBS drama series

Newcomer Amber Clayton is joining CBS' new drama series "Three Rivers" as a regular.

The Alex O'Loughlin starrer "Three Rivers" is about organ transplants seen through three points of view: the doctors, donors and recipients. Clayton will play witty pragmatic young ER doctor Lisa Reed who helps facilitate transplant cases.

The medical drama also is recasting a lead played in the pilot by Julia Ormond.