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Stephen Feralio worked as Nygard's personal videographer between 2011 and 2014
He is accused of using his prominence in the fashion industry to lure women and girls in with the promise of modeling or other job opportunities before he and his associates sexually assaulted them.
The allegations span a 25-year period and involve more than 80 women in the US, the Bahamas and Canada, among other locations.
'If I don't expose him, he's going to get away with all the things that he's been doing,' Feralio told CBC of his decision to come forward with his footage of Nygard.
Then based in Los Angeles, Feralio says that he was told to 'film literally everything' when he was hired, and that Nygard believed 'the reason why Jesus is so popular is because he had a good PR team'.
Yet, Feralio told the Canadian network that he soon discovered he was going to get an insight into the shady antics of the fashion mogul, and his interactions with women at the 'pamper parties'.
'Nygard would just come down and choose a girl. Usually they would be drunk,' said Feralio of the weekly events.
'He would be grabbing them, dancing with them. And then at the end of the night, he would give me the signal and that meant stop filming. And he would go upstairs to the room sometimes with two or three or more girls.'
Stephen Feralio was hired by the 79-year-old in 2011 and recorded hours of his 'pamper parties' - a Sunday ritual in which Nygard would invite groups of girls and women for beach, food and dancing in the Bahamas or Los Angeles.
Yet, he also allegedly used the parties as an opportunity to recruit victims, as Feralio reveals how he would be given the signal to stop filming as Nygard chose two or three girls to go up to his bedroom.
Feralio said he was also filming when Nygard singled out a 16-year-old runner at the 2012 London Olympics as a target, telling another woman he was traveling with to get the girl's number.
Newly released video shows disgraced fashion mogul Peter Nygard hosting boozy parties on his private plane as teenage girls danced around a stripped pole, pictured
The front of the plane also had a bed where Nygard would hold orgies with the women
Lawyers for Nygard are appearing in court in Winnipeg, Canada, on Thursday as he argues for his release from prison over health concerns.
He was arrested by Canadian authorities on December 14 - on an extradition warrant at the US government's request - on charges of assaulting dozens of women in a decades-long sex trafficking scheme.