A hero paramedic and fit father of three died suddenly while working out a gym, leaving his family struggling to pay the mortgage while grieving.
Steve Nguyen, 44, from Sydney's west had a heart attack and died after collapsing during interval training at an F45 gym in April this year.
Mr Nguyen's colleagues tried desperately to save his life when they were called to his gym, and he was rushed to the intensive care unit at Liverpool Hospital in Sydney.
Coworkers and his wife Carpe - an ICU nurse - looked after Mr Nguyen, but he died two weeks later after another cardiac arrest on May 2.
Hero paramedic and father of three Steve Nguyen (left) died suddenly while working out a gym
Steve Nguyen (pictured) saved thousands of lives during his career as a paramedic of 12 years
The paramedic had gotten onto a health-kick about 18 months before, and his friend and co-worker Asaeli Williams, 35, told 7NEWS he was very healthy.
'We would go to [heart attack cases] fairly often. If you look into people's history there's usually something there,' he said.
The death of Mr Nguyen has left his grieving wife Carpe to pay for their mortgage with only half their income, as well as support their three children.
Mr Williams wrote on a Gofundme page that his friend was known for his 'incredible sense of humour' and said he had saved thousands of people's lives in his 12-year career at Fairfield Station and Bankstown Superstation.
'[Staff] always held Steve in high esteem, not only for his years of experience and knowledge but for his incredible sense of humour,' Mr Williams said.
'Steve always brought a smile to everyone when he entered a room. There wasn't a bad job or brutal night shift that Steve couldn't defuse with a well-timed joke and a sneaky smile.'
Mr Nguyen (pictured with a colleague) was known by friends by his dark sense of humour
The father of three (right) worked hard to provide his three children everything they wanted
Mr Williams said Mr Nguyen worked hard to provide his three children - 18-year-old Chelsea, 15-year-old Miranda and 12-year-old Winston - everything they wanted.
'He adored and loved [them] more than anything in the world. Conversations with Steve would always involve talking about how proud he was of his kids and their achievements,' he wrote.
'Steve would often talk about plans to take them overseas or make sure they all had the newest tech. It was clear to anyone who knew Steve, nothing was too good for his kids.'
The Gofundme page as raised over $47,000 to date.