She died today at the age of 80. She was a terrific actress as can be seen in this article about her. Although she made her mark in comedy, she was excellent in the dramatic film Ordinary People where she played a cold mother dealing with the death of her son and for which she was nominated for an Academy Award.
In the The Mary Tyler Moore Show show that ran from 1970 to 1977, she portrayed a single career woman struggling to make her way in a male-dominated world. Here one episode.