Natalie Cole’s family have revealed that the Grammy-winning singer’s death was caused by heart failure induced by lung disease. Cole died on December 31st at the age of 65 and had battled numerous health uses throughout her life, including undergoing a kidney transplant in 2009.

Natalie ColeNatalie Cole’s cause of death has been revealed as heart failure induced by lung disease.

In a statement to the Associated Press on Thursday, the singer’s family said: "[Cole] responded well to pulmonary arterial hypertension-specific agents over many years, during which she performed many concerts world-wide, but eventually succumbed to intractable right heart failure, an outcome that unfortunately commonly occurs in this progressive disorder.”

Cole’s death was announced by her family on December 31st, with a statement reading: "It is with heavy hearts that we bring to you all the news of our mother and sister's passing. Natalie fought a fierce, courageous battle, dying how she lived..with dignity, strength and honour.”

More: Tributes Pour In For Natalie Cole, Who Has Died Aged 65

“Our beloved mother and sister will be greatly missed and remain UNFORGETTABLE in our hearts forever.” Cole’s health problems over the years were well documented and she had suffered from various issues including hepatitis C and kidney failure.

Following her passing, tributes were paid to Cole on social media by some of music biggest names, including Tony Bennet who wrote: ‘I am deeply saddened to hear of the passing of Natalie Cole, as I have cherished the long friendship I had with her, her father Nat, and the family over the years. She was a lovely and generous person who will be greatly missed.’