Metal rocker and pioneer, Ronnie James Dio, died at the age of 67, Sunday morning.
Dio announced last summer that he had been battling stomach cancer, but hoped to return to the stage to perform again.
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"Today my heart is broken," said Wendy Dio, the singer's widow on his official website. "Please know he loved you all and his music will live on forever."
"He possessed one of the greatest voices in all of heavy metal, and had a heart to match it," said Twisted Sister guitarist Jay Jay French, reported the Associated Press. French added, "He was the nicest, classiest person you would ever want to meet."