The family of a man who died after waiting more than two hours for an ambulance, despite living just blocks from a major hospital, demands answers.

Nicholas Bradford, 51, called triple-0 from his Annerley home in Brisbane, Queensland, shortly after 10pm on Saturday, reporting chest pain.

WATCH THE VIDEO ABOVE: Family demands answers after man dies waiting for ambulance

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Bradford was classified as a Code 1C patient, one of the highest-priority categories in the ambulance triage system.

Around six minutes later, a triple-0 operator called back to check on his condition, which was reportedly unchanged.

But paramedics did not arrive until about 12.10am, more than two hours after his call.

They then had to wait another half an hour for police to arrive and help them gain access to the home.

Bradford was found dead in his bed after suffering a catastrophic heart attack.

Nicholas Bradford’s brother Daniel is demanding answers after the 51-year-old died waiting more than two hours for an ambulance. Credit: 7NEWS

“He’s been on his own in that period, in fear, desperate for help which obviously didn’t arrive,” his brother Daniel Bradford said.

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His family had believed an ambulance was only minutes away. They only learned the extent of the delay after watching 7NEWS reports on Thursday.

His brother described the devastating loss, particularly given the possibility Bradford could have been saved.

“Only until you’ve experienced that, I don’t think you can quite understand what it’s like,” he said.

“But then to lose them in a fashion that they possibly could have been saved. And, you know, that’s hard to reconcile with.”

Bradford, a civil engineer described as “loved by many”, lived just a few blocks from Princess Alexandra Hospital but was too unwell to drive himself.

“It’s sad he was so close yet he might as well have been on Everest, it made no difference in the end,” his brother said.

His family is now demanding a full investigation into how the delay occurred.

They need to undertake a full investigation on how it’s possible,” his brother said.

“This really needs to be a line in the sand, where something is done so it just doesn’t happen again.

“It’s hard to come to any other conclusion other than he was failed by the health system.”

Paramedics arrived more than two hours after Nicholas Bradford called triple-0 reporting chest pain. Credit: 7NEWS

Queensland Ambulance Service is reviewing the circumstances surrounding Nicholas Bradford’s death. Credit: 7NEWS

The family also wants answers about whether Bradford suffered and whether he could have survived.

An autopsy had not been carried out, and the family made a last-minute bid to stop his body from being moved to the crematorium.

The move was stopped, allowing the family to pursue answers about his death.

Queensland Ambulance Service said a review into the matter was underway.

“The death of a patient is a tragedy and we extend our condolences to their family and loved ones,” QAS said.

“While we are limited in what we can say due to patient confidentiality, a review into the matter is underway.”

Health Minister Tim Nicholls said the circumstances were tragic and apologised to the family if they had learned about the case through the media.

“An incident review will be undertaken. If there are opportunities to learn lessons from this ... we will apply them,” he said.

“We extend our deepest sympathies to the family.”

The death comes amid continued pressure on Queensland’s ambulance and hospital system.

Latest Queensland Health data shows 42 per cent of patients arriving by ambulance at the state’s 26 largest public hospital emergency departments waited more than 30 minutes to be transferred into hospital care in August.

The data also recorded an average of 17.2 lost minutes per ambulance, beyond the recommended handover target.