When 51-year-old Glenn Colmer started getting headaches and dizzy spells, he brushed them off as signs of getting older. His doctor suggested painkillers — maybe even new glasses. But less than a week after his first seizure, Glenn was gone.

The beloved sports teacher from Southampton suffered a sudden collapse at home in February. Scans revealed a devastating truth — a high-grade glioma, one of the deadliest forms of brain cancer. Within ten days, the “healthiest man I knew,” as his wife Ali described him, had slipped away forever.

“In just ten days, we went from thinking it was nothing serious to saying goodbye,” Ali said. “He was so strong, so full of life — we joked he was invincible.”

Glenn, a dedicated father of two, inspired generations of students during his 20-year career. Former pupils included Olympic athletes and professional footballers, a testament to his passion and kindness. His funeral drew hundreds who came to honor the man who “made everyone feel seen.”

Now, his family is turning heartbreak into purpose, raising funds for Brain Tumour Research. “It can strike anyone, at any time,” Ali said.

Glenn’s story is a painful reminder — sometimes the smallest symptoms hide the cruelest truths.