Actress Katherine MacGregor, best known to TV audiences for her role as town gossiper Harriet Oleson on the long-running family drama Little House on the Prairie, has died at the age of 93. According to The Hollywood Reporter, MacGregor died on Tuesday at the Motion Picture and Television Fund’s retirement home in Los Angeles. Little House star Melissa Gilbert (Laura Ingalls Wilder) eulogized her former castmate in a touching Instagram post.