With the Spanish capital on heatwave alert, the 60-year-old had set out for work that day in July 2022 with two two-litre bottles of water and a spray bottle to cool off.
"He knew he had to keep hydrated. But that day, it obviously wasn't enough," Gonzalez's son Miguel Angel told AFP.
Gonzalez had only recently started a one-month contract as a street sweeper. He normally worked the cooler morning shift but had swapped shifts as a favour to a colleague and began at 2 pm, when temperatures were at their highest.
His death made headlines in Spain and thrust the spotlight on the threat posed by scorching temperatures, especially to outdoor workers and the more vulnerable.
- Organs began to fail -
When emergency services arrived in the working-class neighbourhood in southeastern Madrid where Gonzalez had collapsed, they found his body temperature was 41.6 degrees Celsius.
They applied ice to his neck and armpits to try to cool him down, hydrated him with a saline solution and put him under a hypothermic blanket before rushing him to hospital, said a spokeswoman for Madrid's emergency services.
His liver and kidneys were already failing by the time his family arrived at his bedside and doctors gave them "no hope", Miguel Angel said.
"His back was purple as if he'd been on the ground for a long time... He had a lot of equipment around him, like an ice shield and several fans. He was lying down with his eyes covered," he said.
Gonzalez died on July 16, 2022. His death certificate said he suffered fatal organ failure due to high body temperatures. His death was classified as a workplace accident.
"When body temperature rises above 40 degrees Celsius, the defence mechanisms we have to combat heat, such as sweating, stop working," the spokesman for the Spanish Society of General and Family Physicians (SEMG), Lorenzo Armenteros del Olmo, told AFP.
In scorching temperatures the body pushes blood quickly to the skin where it can release heat, reducing the flow to internal organs.
- 'Hard to talk' -
"It affects the whole body and that's when the organs start to fail," said Eduard Argudo, an intensive care doctor at Barcelona's Vall d'Hebron hospital, adding quick medical care is key to avoiding irreversible organ failure.
"Sometimes the damage is such that, even if we manage to control the temperature, we can't reverse the damage to the organs," he told AFP.
"Heatstroke is a medical emergency, and these patients always go into intensive care," he added, warning it has a "high mortality rate".
With climate change likely to drive temperatures even higher in coming years, the dangers look set to rise even further.
Miguel Angel said that a few days before his father died, he crossed paths with him on the train as Gonzalez was coming home and "he told me it was hard for him to talk because of the heat he was feeling".
"When he got home, after greeting us, the first thing he would do is go to the swimming pool to cool off," his son added.
Gonzalez's death shook up public opinion in Spain and led Madrid city hall to adopt measures halting outdoor work during heatwaves as well as to avoid working in the hottest hours of the day during.
A Madrid park now bears his name.
Miguel Angel said that after his father passed away he was on his computer and saw he had recently done a Google search on "What to do about heatstroke".
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