According to an Instagram post made by her family, the 'Grease' actor died "peacefully at her Ranch in Southern California... surrounded by family and friends" on Aug. 8. She had battled breast cancer for over 30 years. "We ask that everyone please respect the family's privacy during this very difficult time. Olivia has been a symbol of triumphs and hope for over 30 years sharing her journey with breast cancer.", Olivia Newton-John's family, via Instagram. "Her healing inspiration and pioneering experience with plant medicine continues with the Olivia Newton-John Foundation Fund, dedicated to researching plant medicine and cancer."