Nancy Walker, an actress whose roles ranged from the domineering mother of "Rhoda" to Rosie the waitress on paper towel commercials, died Wednesday at her Los Angeles home after a two-year battle with lung cancer. She was 69. Miss Walker's portrayal of Ida Morgenstern, Valerie Harper's mother on "Rhoda," earned her an Emmy nomination in 1975. Miss Walker also was famous as Rosie, the waitress always mopping up after klutzy customers in commercials for Bounty paper towels. Miss Walker's most recent work was a starring role in Fox Broadcasting Co.'s "True Colors" comedy. She played a Jewish mother whose daughter is married to a black. Family friend Frank Liberman said Miss Walker had just completed the season's final episode.