By Eric Renner Brown
January 08, 2016 at 06:50 PM EST
Chris Pizzello/AP

Natalie Cole’s family revealed the singer’s cause of death Thursday. According to a statement, Cole died of idiopathic pulmonary arterial hypertension, which led to heart failure. Cole died on Dec. 31 at the age of 65.

The Cole family’s statement explained that after receiving a kidney transplant in 2009, doctors diagnosed the singer with pulmonary arterial hypertension, a lung disease causing shortness of breath, dizziness, and chest pain. The family added that Cole had previously “responded well to pulmonary arterial hypertension-specific agents over many years … but eventually succumbed to intractable right heart failure.”

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The daughter of Nat King Cole and Maria Hawkins Cole, Natalie Cole began singing at the age of 6 with her father and went on to win nine Grammy awards and record hits including “This Will Be” and “Inseparable.” In addition to her heart condition, Cole had battled drug addiction and hepatitis C.