LONDON -- A British coroner says George Michael died of natural causes as the result of heart disease and a fatty liver.

Darren Salter, senior coroner for Oxfordshire, says a post-mortem has found that the singer died of “dilated cardiomyopathy with myocarditis and fatty liver.”

Dilated cardiomyopathy is a condition in which the heart’s ability to pump blood is limited, while myocarditis is inflammation of the heart muscle.

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Michael died at his home in Oxfordshire county, southern England, on Dec. 25. He was 53. An initial autopsy failed to determine the cause of death.

Salter said Tuesday that because Michael died of natural causes, no inquest will be held.

At the time of his death, Michael’s manager told CBS News that he died of heart failure.

In 2011, the singer had a life-threatening bout of pneumonia. At the time, he thanked the staff at Vienna General Hospital for keeping him alive in the intensive care unit.

Michael enjoyed immense popularity early in his career as a teenybopper idol, delivering a series of hits such as “Wake Me Up Before You Go-Go,” ‘’Young Guns (Go For It)“ and “Freedom.” As a solo artist, he developed into a more serious singer and songwriter, lauded by critics for his tremendous vocal range. He sold well over 100 million albums globally, earned numerous Grammy and American Music Awards, and recorded duets with legends like Aretha Franklin, Ray Charles, Luciano Pavarotti and Elton John.