She has since been inundated with tributes to one of the acting world's "brightest and clearest voices".
She said Jack was unable to see his wife, fellow dialect coach Gabrielle Rogers, who he was "madly in love with", before he died because she was "stuck in quarantine in Australia, having just flown in from New Zealand last week.
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Fellow Star Wars actor Greg Grunberg said he was "devastated" to learn of Jack's death, calling him a "wonderful, talented, beloved gentleman".
"He was one of the kindest people I've ever worked with," told the BBC.