Paris Fury has revealed she was terrified by husband Tyson's struggles with addiction after his greatest boxing triumph, admitting the man she knew appeared to have disappeared.
The former heavyweight world champion, 38, discusses his mental health in a Netflix documentary examining his life inside and outside the ring.
Fury defeated Wladimir Klitschko in Dusseldorf in 2015 to fulfil the ambition that had driven him since childhood.
But the victory was followed by a period of alcohol and cocaine addiction, with his wife witnessing the devastating impact.
An emotional Paris recalls a conversation immediately after the Klitschko fight which took on a different significance as her husband's condition deteriorated.
"Straight after [the Klitschko fight], Tyson said to me 'this is as good as it is ever going to get'. I didn't understand at the time what he meant," she says.
"The Tyson I knew was gone and I was so scared."
Her account features in the trailer for Tyson Fury, a feature-length documentary which arrives on Netflix on November 27.

The film explores how reaching the summit of heavyweight boxing left Fury struggling to find a purpose beyond the opponent he had spent years pursuing.
Reflecting on the build-up to his breakthrough victory, he says: "All I wanted to was beat Klitschko. It was an obsession for me.
"I'd achieved all my childhood dreams, but my whole point of existence had been taken away. I didn't want to live."
The documentary also examines Fury's upbringing and the difficulty of discussing feelings in a family environment where strength was prized and emotions were rarely expressed.
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"Growing up in my family, there was no emotion shown," he said.
"They were all hard nuts. Like 50cent said: 'Show no love, love will get you killed.'"
Directed by Lucy Wilcox, the film includes interviews with Paris and Fury's father John, alongside previously unseen archive footage.
Netflix says it will explore addiction, mental health, family relationships and the loss of a child, tracing the experiences behind one of British sport's most recognisable personalities.
Fury eventually returned to professional boxing in 2018, beginning a comeback that would take him back to the top of the heavyweight division.
His three-fight rivalry with Deontay Wilder brought another world title, with Fury winning the WBC belt before defeating the American again in their final meeting.

He later pursued undisputed heavyweight glory against Oleksandr Usyk, but suffered two defeats against the Ukrainian.
The documentary follows Netflix's earlier access to the family through At Home With The Furys, which first appeared in 2023.
Its release comes two weeks before another major chapter in his career, with Fury scheduled to face Anthony Joshua on December 11.
Netflix will broadcast the long-awaited British heavyweight showdown from Cardiff's Principality Stadium.
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