Conrad Readman from Colchester took two weeks off work and had tickets for every day of the Olympics, but suffered a suspected heart attack while watching Victoria Pendleton and the men's team pursuit.
The 49-year-old, who had been to the opening ceremony and seen many of Team GB's gold medal moments, was found ill in the venue's toilets before being sent to hospital, where he died.
Mr. Readman lived at home with his mother Joan. She told the Colchester Gazette of her devastation at the news.
"He had been looking forward to the Olympics ever since it was announced. There was never a day he was not excited about it," she said.
"He was coming home every night so excited and telling me about everything he had done.
"He had never had a problem with his heart and had not been to a doctor in 15 years. He died doing something he loved so I am happy he was where he was, but I can't watch any of it now."
Tim Peyton, his employer, added: "I have worked with him since 1982 and am shocked. He was a lynchpin for us. Clients and staff liked him.
"He will be sorely missed."
Mr. Readman was also a keen football fan. He had a season ticket with Tottenham and travelled the world to watch England play.