Rona Newton-John, sister to “Grease” star Olivia, has lost her battle with brain cancer. She was 70 years old.

Olivia was at her sister’s side when she passed, after announcing just last month that Rona had an aggressive form of cancer. The actress posted about her loss on Facebook, saying that sadly, Rona died on their mother’s birthday.

“My beautiful sister Rona sadly passed on May 24th in Los Angeles,” she wrote. “It was May 25th in Australia – which was our mother Irene’s birthday. Rona died of a very aggressive brain tumor and mercifully suffered no pain. She was surrounded by the love of her four children – Fiona, Brett,Tottie and Emerson and, her wonderful friends. I will miss her forever – my beautiful, smart, talented, funny, brave sister Rona.

In lieu of flowers the family would appreciate
donations to the ONJCWC where a brain tumor wellness program will be started in her name. Thank you all for your kind words of love and support.”

Olivia Newton-John suffered from breast cancer herself, but has been in good health in recent years. She recently postponed her Vegas residency to care for Rona.

“In light of this news, I have decided to postpone my forthcoming Las Vegas residency to spend time with her and our family,” Newton-John wrote in a statement. “As a cancer ‘thriver’ myself, as many people are, I am very aware of the importance of love, support and family during this journey she is about to begin.”

Image: Facebook