According to the NY TIMES,
Olivia Newton-John, who sang some of the biggest hits of the 1970s and ’80s while recasting her image as the virginal girl next door into a spandex-clad vixen — a transformation reflected in miniature by her starring role in “Grease,” one of the most popular movie musicals of its era — died on Monday at her ranch in Southern California. She was 73.
The death was announced by her husband, John Easterling, who did not give a specific cause in his statement, though he cited the breast cancer diagnosis she had lived with since 1992. In 2017, she announced that the cancer had returned and spread. For years she was a prominent advocate for cancer research, starting a foundation in her name to support it and opening a research and wellness center in metropolitan Melbourne, Australia. English-born, she grew up in Australia.
Ms. Newton-John amassed No. 1 hits, chart-topping albums and four records that sold more than two million copies each. More than anything else, she was likable, even beloved.