Image caption, Sharon Osbourne spoke to BBC News as the family prepares to release a film about Ozzy's final concert with Black Sabbath

It's been 15 months since Ozzy Osbourne died, at the age of 76, at his home in Buckinghamshire.

Although he had suffered from health problems for years, including Parkinson's disease and a fractured vertebra, his death was a shock.

Less than three weeks beforehand, he had been on stage in Birmingham, playing a triumphant farewell concert.

After the show, he was on a high.

"He was just so, so happy," recalls his wife Sharon.

"He was online, going through the reviews and saying, 'There's something terribly wrong', and I'm like, 'Why?'

"He goes, 'I didn't get slagged by anybody. Why are people being nice to me?'

"And I'm like, 'Because they like you'."

On the morning he died, Ozzy had woken up early and gone downstairs for his usual morning workout. Shortly afterwards, he had a heart attack. An air ambulance was called and paramedics tried to save him.…