Florence Henderson's death heightens drama of Palm Springs theater company's benefit show
Henderson, best known as the matriarch of TV's first blended family show, "The Brady Bunch," died Thursday, less than 48 hours before she was scheduled to star in a Coyote Stageworks benefit reading of "Steel Magnolias" at the Annenberg Theater. Doctors told her Tuesday she was too sick with the flu to fulfill her commitment, so company founding artistic director Chuck Yates reached out to actress Cathy Rigby, who in…