Olivia Newton-John, a pop culture icon best known for her role as Sandy in "Grease" and hit songs like "Physical," has died Monday, August 8, after a 30-year battle against breast cancer. She was 73.

Newton-John's husband, John Easterling, shared the sad news about her wife's passing on her official Facebook page. As tributes pour in, see how the British pop singer clung to hope as she tried to overcome her illness.

In a statement, Easterling said the "Xanadu" star died peacefully at her ranch in Southern California, surrounded by her family and friends. He then described his wife as the symbol of triumphs and hope for the past 30 years as she shared her journey through breast cancer.

Though she's gone, Easterling added that her "healing inspiration and pioneering experience with plant medicine" would continue with the Olivia Newton-John Foundation Fund, which was dedicated to researching plant medicine and cancer. The family asked everyone to respect their privacy during this very difficult time.

For 30 years, Newton-John was publicly open about her fight against breast cancer. She was first diagnosed in 1992, the same weekend her father died of cancer, but she continued to live a fulfilled life outside the disease, per NBC News.

She remained optimistic and embraced a mindset that prioritized her family. In an interview with "Today" in 2020, she said cancer could engulf one's mind and being, so she chose not to live with that.

She underwent a partial mastectomy, chemotherapy and breast reconstruction. But in 2020, she was already diagnosed with stage four metastatic breast cancer-her third bout with the disease. Her second diagnostic was in 2017 when her breast cancer metastasized to her lower back, USA Today cited.

Newton-John opted for alternative medicine, which she said was able to help to strengthen her body. She was committed to cancer research and raising money.

She opened the Olivia Newton-John Cancer Wellness and Research Center in Australia in 2015. The "Hopelessly Devoted to You" hitmaker advocated for plant-based treatments and wanted the medical community to take them seriously.

Her dream was for the medical community to "know what works" someday, keen on bringing an alternative path that included herbs and Eastern medicine. Newton-John also believed positive thinking could help heal and recover; thus, she often shared optimism with the world. As she said, she lived, loved and sang beyond cancer, she wanted that to happen to everyone.