Heavy metal icon Ozzy Osbourne died of heart attack, death certificate shows

Ozzy Osbourne, the heavy metal icon and self-styled Prince of Darkness, died of a heart attack, according to a death certificate filed in London and reviewed by the New York Times.

The certificate confirms that Osbourne died of "(a) Out of hospital cardiac arrest (b) Acute myocardial infarction (c) Coronary artery disease and Parkinson’s disease with autonomic dysfunction (Joint Causes)."

The former Black Sabbath frontman had been diagnosed with Parkinson's in 2003.

Osbourne died at home surrounded by his family on 22 July at the age of 76, just weeks after his farewell concert in Birmingham.

Either clad in black or bare-chested, the singer was often the target of parents' groups for his imagery and once caused an uproar for biting the head off a bat.

Later, he would reveal himself to be a slightly doddering and sweet father on the reality TV show "The Osbournes."

Black Sabbath's 1969 self-titled debut LP has been likened to the Big Bang of heavy metal.

It came during the height of the Vietnam War and crashed the hippie party, dripping menace and foreboding. The cover of the record was of a spooky figure against a stark landscape.

The music was loud, dense and angry, and marked a shift in rock 'n' roll.

The band's second album, "Paranoid," included such classic metal tunes as "War Pigs," "Iron Man" and "Fairies Wear Boots."

The song "Paranoid", which hit top ten on many charts across Europe, became in many ways the band's signature song.

Both albums were voted among the top 10 greatest heavy metal albums of all time by readers of Rolling Stone magazine.

"Black Sabbath are the Beatles of heavy metal. Anybody who's serious about metal will tell you it all comes down to Sabbath," Dave Navarro of the band Jane's Addiction wrote in a 2010 tribute in Rolling Stone.

"There's a direct line you can draw back from today's metal, through Eighties bands like Iron Maiden, back to Sabbath."

Black Sabbath fired Osbourne in 1979 for his legendary excesses, like showing up late for rehearsals and missing gigs.

"We knew we didn’t really have a choice but to sack him because he was just so out of control. But we were all very down about the situation," wrote bassist Terry "Geezer" Butler in his memoir, "Into the Void."

Osbourne re-emerged the next year as a solo artist with "Blizzard of Ozz" and the following year's "Diary of a Madman," both hard rock classics that went multi-platinum and spawned enduring favourites such as "Crazy Train," "Goodbye to Romance," and "You Can't Kill Rock and Roll."

Osbourne was twice inducted to the Rock & Roll Hall of Fame, once with Sabbath in 2006 and again in 2024 as a solo artist.

The original Sabbath line-up reunited for the first time in 20 years in July 2025 in the UK for what Osborne said would be his final concert.

"Let the madness begin!" he told 42,000 fans.

"Black Sabbath: we'd all be different people without them, that's the truth," said Pantera singer Phil Anselmo. "I know I wouldn’t be up here with a microphone in my hand without Black Sabbath."

Thousands of fans lined the streets of Birmingham to pay respect to Osbourne as his funeral cortege made its way through the city on 30 July.