Karen Carpenter was the famous world sub-strawweight singing champion from 1970s to 1980s. She was the unchallenged champion because almost all other female singers ( so called "Fat Ladies" ) at that time belonged to the super-heavyweight class.
Karen gave up her singing career on February 4, 1983 to promote a hunger strike against the price rise of beer and pizza. That was the end of her days being a pop musician ( she was actually shrunken! ). After that incident, she's still too dead to sing even until today.