Tyson Fury needed someone with him '24/7' during his mental health battle, according to close friend Isaac Lowe.
The Gypsy King was on top of the world when he beat Wladimir Klitschko back in 2015 to become world champion.
However, in the immediate months and years that followed, Fury battled depression.
He retreated from boxing, with his weight ballooning to 28 stone, with the Gypsy King then proceeding to return to the ring by drawing with Deontay Wilder in December 2018.
Tyson Fury battled depression after beating Wladimir Klitschko in 2015
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Fury would go on to beat Wilder twice and has since become a big advocate of men speaking about their mental health problems.
And close friend Lowe, speaking in the new series Fury Uncovered, has revealed the 35-year-old needed somebody with him '24/7' when he was at his lowest.
"Someone had to be with him 24/7," he said. "More or less all the time."
He added: "You can be the richest man in the world, you can have everything.
"But if you've got horrible thoughts going through your head, you're better being with someone."
Kristian Blacklock, Fury's strength and conditioning coach, also speaks in the episode.
And Blacklock revealed the Briton foresaw his battle with depression immediately after his stunning win over Klitschko.
He said: "Before he fought Klitschko, I asked him specifically 'what are you going to do when you win'.
"And he said 'I'll be miserable.'
"I said 'aren't you going to go on holiday, with your family, with your kids to celebrate?'
Tyson Fury's best friend Isaac Lowe has revealed the boxing star needed someone with him '24/7' during his depression battle
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"He goes 'nah, I'll probably be really depressed'.
"It was like his ultimate goal in life, obviously he's achieved it, where do you go from here?"
Fury discusses his childhood in Episode 1, too, revealing he was happy as a child.
"We had a lot of fun as kids, we were allowed to roam free," he said.
"We lived on a farm in Cheshire, played up and down in trees and fields and rode motorbikes and stuff like that.
"It was good, we had a good childhood."
And his father, John, reveals Fury was a keen fighter from a very young age - along with the rest of his brothers.
"They were always hitting one another, always jabbing and pushing, wanting to spar and fight one another," he says with a smile on his face.
"There was many a time when I'd sit and say 'look behave yourselves, I'm watching the television'. There's a picture on, behave yourself.
"They'd stop for five seconds and start again.
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Tyson Fury is enjoying life again as his boxing match with Oleksandr Usyk nears
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"He was always the one playing, punching... it was in him to do it."
Fury and Usyk will fight in Saudi Arabia on May 18.
If the Briton wins it would be the pinnacle of his glittering career, with the 35-year-old hoping to become undisputed heavyweight champion of the world.
