- Before moving to Los Angeles, California (1970), Ms. MacGregor worked as a stage actress on Broadway, off Broadway and in regional theatre in and around New York City.
- Resided at the Motion Picture & Television Fund residences in Woodland Hills, California. After her retirement, she occasionally wrote, directed and produced plays for the Wee Hollywood Vedanta Players, a children's theater group.
- Broadway and stage actress.
- Received her Bachelor of Science degree from Northwestern University in Evanston, Illinois (1947).
- Best known by the public for her role as the gossiping, greedy, nasty and arrogant Mrs. Harriet Oleson on Little House on the Prairie (1974).
- Katherine MacGregor passed away on November 13, 2018, two months away from what would have been her 94th birthday on January 12, 2019.
- She was a lifelong Democrat.
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