American actress and songwriter Olivia Newton-John died on Monday (8) at the age of 73, her family said.

The cause of death has not been confirmed, but she had been battling breast cancer for more than 30 years.

"Olivia Newton-John died peacefully at her ranch in Southern California this morning surrounded by family 

and friends. We ask everyone to respect the privacy of the family at this very difficult time," wrote the artist's husband, John Easterling, on the actress' social media.

In the message, Easterling recalled the 30 years in which Newton-John battled cancer and asked that, "instead of

sending flowers, the family asks for donations in her memory for her research foundation."

The British woman, with Australian nationality, had a long career and her first successful international appearance came in 1974 during the Eurovision festival, finishing in fourth place.  

Four years later, her performance in the feature film Grease, alongside John Travolta, elevated her to 

an international star.  Throughout her career, she released 25 studio albums of music and received several

major awards for her work, including four Grammys between 1973 and 1982.