According to her family: Newton-John’s niece, Tottie Goldsmith, told A Current Affair at the time that her aunt’s death wasn’t a “shock.” “It’s not a shock — we’ve known how sick she’s been, especially in the last five days,” she said. “It wasn’t just the cancer that got her; it was other complications, being in a hospital and with a very susceptible immune system. She got secondary infections. She really went down in the past five, six days.”
Anyone that's dealt with cancer understands it is almost always complications that get you. Cancer just wreaks havoc on the body and all the things that protect us just can't handle it anymore. It's a horrible thing to watch.