36-year-old Stu Grant after suffering a seizure while working out the David Lloyd gym near Sixways the day before.
The seizure, which was unrelated to his workout, was the result of a fatal brain bleed.
After being rushed to Worcestershire Royal Hospital, consultants quickly realised the catastrophic damage caused by the rupture, and his family were told her died a short time later.
Mr Grant was a fitness fanatic who loved working out (Image: Courtesy Jodie Grant / SWNS)
Mr Grant’s sister, Jodie Grant, said: “Stu was the healthiest man I ever knew, he was good at everything, and he was the most amazing man ever.
“I think he’d had a few headaches but it was normal, he just put it down to stress and normal life, and bought himself some blue light glasses for work.
“Suddenly I was getting a call from my mum to say my older brother was going to die, or be severely brain damaged. And he died.
“I’ve never experienced anything like this, losing a healthy sibling with no warning. It fundamentally changes you.”
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Mr Grant collapsed at his gym before being rushed to Worcestershire Royal Hospital (Image: Courtesy Jodie Grant / SWNS)
The seizure was caused by the spontaneous rupture of a arteriovenous malformation – an abnormal cluster of blood vessels on his brain stem.
Mr Grant had not been aware he had the condition, and some can live a full life without ever knowing they have the potentially deadly condition.
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While AVMs can occur anywhere on the body and can be survivable, the location of Mr Grant’s on his brain meant this was highly unlikely.
Mr Grant was just 36 when he died, with his death coming completely unexpectedly to his family (Image: Courtesy Jodie Grant / SWNS)
Because Mr Grant, who died on March 18, was on the organ donation register, his donated organs saved three lives.
Ms Grant said: “His heart and lungs were too damaged from the trauma, but his liver went to a 30-year-old female who would have died without it.
“His two kidneys went to two older men in their 50s and 60s.”
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Both Ms Grant and her other brother, James, are now trying to get tested to see if they have AVM, while raising awareness of the condition by climbing mount Snowden for The Butterfly AVM Charity.
A GoFundMe launched by the family has raised over £3,000 in less than a month for the charity, which funds research aiming to develop treatments that can save lives, blood tests capable of detecting AVM risks early, and a better understanding of the abnormalities that lead to AVMs.