Olivia Newton-John, best known for her role in 'Grease,' dies at 73

Olivia Newton-John was best known for her acting role as Sandy in "Grease" and iconic '80s hit "Physical."
Olivia Newton-John, the Grammy Award-winning singer and actress best known as the goody two-shoes Sandy in "Grease," has died at age 73 following her battle with breast cancer.

Newton-John's husband, John Easterling, confirmed his wife's death via her verified Facebook page on Monday, writing that Newton-John "passed away peacefully at her ranch in Southern California this morning, surrounded by family and friends."