The television presenter's family described him as an irreplaceable husband, father, brother, son and friend after his death in in Melbourne early on Monday.
"With completely shattered hearts and without knowing how we can possibly move through life without him, we are devastated to share that Jock passed away," they said in a statement.
"So many words can describe him, so many stories can be told but at this time we're too overwhelmed to put them into words.
"For those who crossed his path, became his mate or were lucky enough to be his family, keep this proud Scot in your hearts when you have your next whisky."
Victoria police confirmed officers attended a Carlton property for a welfare check and found the body of a man about 2am.
His death is not being treated as suspicious and a report will be prepared for the coroner.
MasterChef Australia's broadcaster Network Ten and production company Endemol Shine Australia said they were deeply shocked and saddened by the sudden loss.
"Jock's charisma, wicked sense of humour, generosity, passion and love for food and his family cannot be measured. He will be greatly missed," they said.
He opened Adelaide restaurants Bistro Blackwood and Orana in 2013 after working in top kitchens around the world including Marco Pierre White's acclaimed restaurant in London.
He won the prestigious Basque Culinary World Prize in 2018 and joined MasterChef Australia in 2019.
Chef Gordon Ramsay said he was saddened by the devastating news of Mr Zonfrillo's death.
"I truly enjoyed the time we spent together on MasterChef in Australia. Sending all my love to Lauren and the family in this difficult time," he posted to social media.
Singer Jimmy Barnes said he was speechless.
"Jock was like a brother to me and we made each other laugh and cry. My heart does out to his family," he said.
Endemol Shine Australia chief executive Peter Newman said he would be deeply missed by the MasterChef team.
"Jock was an incredible talent, not just as a renowned chef but as someone who could bring joy into the homes of people in Australia and around the world in his role as judge on MasterChef Australia," he said.
"On set he was loved by the team and his passion for food and the show was infectious.
"He was also a brilliant champion for the contestants on MasterChef, always wanting the very best for them."
The latest series of the programme was due to premier in Australia on Tuesday, however the broadcaster said it would not air this week. It is also set to screen in New Zealand.
Zonfrillo is survived by his wife Lauren Fried and his children Ava, Sophie, Alfie and Isla.
