Jack Osbourne has described the devastating moment he was told his father had died at the age of 76

His death, caused by acute myocardial infarction and out-of-hospital cardiac arrest - following a brutal battle with Parkinson's disease and amid agony after a series of back surgeries - came just weeks after what proved to be his final live performance in Birmingham.

In a new YouTube video, Jack, 39, recalled the last time he saw his father.

He said: "My dad was great. He was in a good mood, he was happy."

Jack added about the moment he was told Ozzy had passed away: "I woke up in Los Angeles to a knock on my house door at around 3.45 in the morning.

"Someone who has worked for my family for about 30 years now was knocking on my door and when I looked through my window and I saw it was him, I knew something bad had happened. I was informed that my father had passed."

Jack went on: "So many thoughts, there was a level of like, 'Okay, he's not struggling. He's not suffering anymore, and that is something'.

"I wish he was still here, you know? I wish he was still with us all, but he was having a rough go and I think people saw that at the show."

Jack travelled to the UK for the funeral and a procession in Birmingham in memory of his late father, where thousands of fans gathered and tributes were left at the Black Sabbath Bridge.

The reality TV personality added about the farewell: "I speak for the family when I say this: we are so grateful for that and it meant so much... it was validating because I know we weren't alone."

Jack added: "I actually shared this at my at my father's funeral.

"There's an interview with Keanu Reeves. He's on some nighttime talk show or whatever and they asked him, 'What do you think happens when you die?'

"And Keanu Reeves answer was, 'I don't know what happens when you die, but what I do know is the people that love you miss you the most'.

"I felt that immensely. (Ozzy) wasn't just a father to me. He was my colleague. We worked together in so many capacities.

"I had recently moved, there was a period where I was between houses and I moved back in with him.

"So, he was my housemate in my late 30s and it was awesome.

"Me and the kids were living here. Just a friend, a text buddy, a joke cracker."