Natalie Cole has died.

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After years of health issues and substance abuse struggles, the singer daughter of Nat King Cole, TMZ shared the sad news.

"Cole, who's hits include 'This Will Be' and 'Unforgettable' which she performed as a virtual duet with dad Nat King Cole -- had sick recently, cancelling several tour dates in late December. She also cancelled an upcoming February concert due to illness," the site revealed on Friday.

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"Natalie struggled with substance abuse and was plagued with health problems, suffering from liver disease in 2008. She ended up getting a transplant. She also contracted Hepatitis C, for which she underwent chemo," TMZ continued.

Although the news only broke moments ago, there have already been several messages posted online, including the ones seen below:

Cole hadn't been active on Twitter or Facebook since September. Her last tweet can be seen below.

Cole leaves one son behind.