From the LA Times:
Bonnie Owens, a cocktail waitress-turned-singer who was married at different times to country music giants Buck Owens and Merle Haggard, died Monday in Bakersfield after a lengthy struggle with Alzheimer's disease. She was 76.
Her death came four weeks after that of Buck Owens, but she may have been too deeply gripped by Alzheimer's to know that he was gone, according to Jim Shaw, a close family friend.