"Ronnie James Dio's bday today. Would be 70 yrs old. Rip Ronnie. U are missed. Will crank some 'We Rock' in his memory". Rocker Tom Morello remembers the late heavy metal icon on what would have been his 70th birthday on Tuesday (10Jul12). The Dio, Black Sabbath and Rainbow frontman lost his battle with stomach cancer in May, 2010.