Jack worked as Hemworth's dialect coach on many blockbusters, including Men in Black: International.
He passed away in London while his wife Gabrielle Rogers remained in quarantine in Australia.
Gabrielle took to Instagram on Monday to discuss the devastating news.
"It breaks my heart to let you know we lost a man today. Andrew Jack was diagnosed with Coronavirus when admitted to hospital less than 48 hours ago in suburban London."
She added: 'He died today. He was in no pain, and he slipped away peacefully knowing that his children, step children, grandchildren, brother, friends, and I were all "with" him. Take care out there, lovers x'.
The UK has recorded 2,900 deaths from COVID-19, with 563 people dying from the disease overnight on Thursday.
Jack's representative Jill McCullough told TMZ that social distancing rules placed doubt on a full funeral.