Ronnie James Dio

Former Black Sabbath frontman's widow says first doctor simply missed the growing problem.

Singer had been going through chemo and was unsure if he'd be up to the task.

He may never have fronted Black Sabbath if British glam band voted him in.

He praised his replacement but said leaving the band was "just like getting divorced."

Wendy discusses the 'Rainbow in the Dark' Dio autobiography and upcoming plans.