Tyson Fury believed a number of people - including his wife Paris - were trying to kill him as he suffered a paranoid panic attack.
The two-time world heavyweight champion appeared to be on top of the world after his stunning win over Wladimir Klitschko to secure the unified titles in 2015.
But behind the scenes, his mental health struggles were getting worse, and his paranoia was beginning to take hold before his diagnosis just under a year after winning the fight.
After suffering a severe panic attack while attempting to go out for a drive, Fury was rushed to hospital in the summer of 2016, where he insisted that he had suffered a heart attack.
And he even accused his wife Paris of 'wanting him dead' in a rant that saw him also claim that his best friend, who had come to his aid while he was unable to move in his car, was out to get him.
Paris detailed the incident in her new autobiography, Love and Fury: The Magic and Mayhem of Life with Tyson, saying that he was told his outbursts were a result of "paranoid delusions".
"The instant Tyson saw me he sat up straight and, much to everyone’s shock, started ranting and raving," she wrote.
"‘I’ve had a heart attack!’ he yelled. ‘My heart rate’s gone through the roof. My body seized up. I couldn’t drive the car. I’m too young to die, Paris, I’m too young to die . . .’
"I tried to respond – ‘Calm down, Tyson, just calm down...' – but he wouldn’t listen and just carried on shouting. I’d never seen him so worked up and agitated.
"Something was wrong. Something was very, very wrong. ‘Everyone here’s trying to kill me,’ he continued. ‘I know Dave wants to murder me. The doctors are trying to poison me. And I bet you want me dead, too, Paris . . .’
"‘What are you saying?’ I said. ‘Stop this, please . . .’ This was too much. It was a living nightmare.
"Tyson was spouting hurtful nonsense and was clearly in the middle of some kind of breakdown."
Fury would later be officially diagnosed with bipolar disorder and obsessive compulsive disorder by a doctor, and the process would begin for his recovery.
However, it would still take years for him to return to boxing, and it was a long road back to the heights of heavyweight title glory once again.
"Being bipolar explained his severe mood swings, which could veer from artificial highs to suicidal lows," Paris explained.
"And the OCD explained his deeply fixated behaviour, which, at different stages of his life, had presented itself via obsessive training or obsessive drinking.
"Receiving professional help, and being able to put a name to his issues, did so much to help him make sense of things."
The diagnosis allowed Tyson and his family to see his issues in relation to legitimate medical conditions, which made it easier to cope with his issues.
"While he didn’t want to be ill, at least he now knew that his personal obstacles and challenges could be linked to recognised mental conditions," Paris continued,
"I was massively relieved by Tyson’s diagnosis, too. Finally, I had some answers.
"While all these medical terms were new to me – I’d never heard of bipolar or OCD before – at least I could try to begin to understand his feelings and behaviours.
"It felt good to finally get some clarity after months of confusion."
Love and Fury: The Magic and Mayhem of Life with Tyson by Paris Fury is available now.Read More Read More