(CNN) -- Actress Bonnie Franklin, a Tony Award nominee who played a single mom at the center of the hit TV sitcom "One Day at a Time," died Friday of complications from pancreatic cancer. Franklin was 69. The woman who played the youngest daughter of Franklin's character on the CBS show, Valerie Bertinelli, said her "heart is breaking" after hearing the news. "Bonnie has always been one of the most important women in my life and was a second mother to me," Bertinelli said. "She taught me how to navigate this business and life itself with grace and humor, and...