British pop icon Marianne Faithfull, a long-time friend and muse for the Rolling Stones, died in London on Thursday at the age of 78, a spokesperson for her music promotion company Republic Media said.

The cause of the singer's death, who is known for the hit song "As Tears Go By," was not immediately known. 

“It is with deep sadness that we announce the death of the singer, songwriter and actress Marianne Faithfull,” the spokesperson said in a statement, per NBC News. “Marianne passed away peacefully in London today, in the company of her loving family. She will be dearly missed.”

The singer, known for dating Rolling Stones front man Mick Jagger, was nominated for a Grammy in 1979 for her rock album Broken English. She previously survived a bout with breast cancer in 2006, and was hospitalized with COVID-19 in 2020.

“I am so saddened to hear of the death of Marianne Faithfull," Jagger said in a statement reported by The Guardian. "She was so much part of my life for so long. She was a wonderful friend, a beautiful singer and a great actress. She will always be remembered.”

She is survived by her son Nicholas Dunbar.

Misty Severi is a news reporter for Just The News. You can follow her on X for more coverage.