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(CNN)-- Sharon Osbourne, the widow of British heavy metal star Ozzy Osbourne, revealed that doctors had told him two weeks before his final concert that he was dying, and urged him not to go ahead with the show.

The British star—who died exactly a year ago—was hailed as a hero when he performed his show titled 'Back to the Beginning' in his hometown of Birmingham, England, on July 5 of last year.

The lead singer of Black Sabbath performed the massive concert at Villa Park stadium, sitting on a black throne-like chair topped with a bat figurine. The concert featured a reunion of the original band members, along with other rock and metal legends such as Metallica, Guns N' Roses, and Alice in Chains.

In an interview with a local BBC radio station, Osbourne said the concert might not have happened at all, explaining: 'Ozzy knew he was dying. He was told two weeks before the show that he was dying, and they told him: Don't do the show.'

But Ozzy—who suffered from Parkinson's disease and died at age 76—had a different opinion; according to his widow, he told them, 'Really? Get out of here.'

She described the show—whose proceeds went to a group of UK charities—as a 'gift' that her husband got to enjoy in his final days, saying: 'It was a gift to be surrounded by his loyal crew, friends, family, and fans.'

She added: 'The greatest love affair of his life was with the audience, and that's how he wanted to end his career; just one last time, and he managed to do it, and he put on an amazing performance.'

She noted that in his final two weeks, 'he was in the happiest state I've ever seen him,' adding: 'It was wonderful to see him smiling every day.'

The event—which she described as a source of 'overwhelming joy'—was a huge morale boost for Ozzy at a very difficult time. She said: 'He was very frustrated and depressed because he knew it was the end,' adding that he was 'very afraid he wouldn't be able to sing.'

Osbourne was in Birmingham to take part in the first-ever 'Ozzy Day' in the city, in memory of her husband. She stated that he was 'proud' of his 'humble beginnings,' and became emotional, shedding tears when asked why it was important for her to be there.

With a trembling voice, she said: 'Because I can't forget what Birmingham gave to Ozzy,' adding that despite achieving global stardom, he never forgot his roots.

When asked about the message she wanted to give to fans on the anniversary of his death, she said: 'In Ozzy's words: When you want to remember me, turn the music up very loud—as loud as possible—and start banging your heads to the beat.'