Russell Norman was well-known for presenting BBC2's six-part doc The Restaurant Man.
The 2014 series saw Russell use his extensive knowledge to help others make their restaurants a success.
His tragic death comes weeks after he published his fourth cookbook.
In 2021, Russell founded restaurant Trattoria BRUTTO and soon had a long waiting list of customers wanting to dine there.
It's understood his wife Jules and son Ollie will now run it.
The tragedy comes just weeks after his fourth cookbook was published.
Russell was well-known for presenting BBC2's six-part doc The Restaurant Man.
The 2014 series saw Russell use his extensive knowledge to help others make their restaurants a success.
One year later, he made an appearance on hit show Saturday Kitchen to cook up a storm.
Business partner Richard Beatty, who co-founded restaurants Spuntino and Polpo with Russell, has since paid tribute to his "best friend".
He said: "It is with the greatest sadness I announce the loss of my best friend Russell Norman.
"After a short battle in hospital, he died surrounded by family and friend.
"Russell is survived by his wife and three children, I ask that you respect the privacy of his family, friends and colleagues at this time."
Award-winning chef and restaurant owner Russell Norman has tragically died at the age of 57.
The BBC Star was surrounded by family and friends Thursday when he died in hospital.