Since the news of Olivia Newton-John’s untimely death went viral, her devoted fans have been looking for her biological siblings.

Hugh Newton-John cause of death: What happened to Olivia Newton-John brother?

Hugh Newton-John happens to be the only biological brother to the late 73-year-old actoress and musician. Sadly all her siblings have passed on. Her only sister Rona passed on decades ago from brain cancer.

Hugh was a highly regarded infectious diseases specialist at Melbourne’s Fairfield Infectious Diseases Hospital in the 1970s and 1980s. He was known for his outgoing personality, razor-sharp intellect, and extraordinary capacity to reassess complex infectious diseases.

However, he passed away earlier three years ago due to health deterioration, according to his sister, although the precise cause of death was not disclosed for public consumption.

At the time Olivia Newton-John posted a message on her Instagram page announcing his passing. To honor her brother’s life and memory, Newton-John posted an Instagram collage of pictures of him.