He had previously been attending the International Wine Challenge awards at Grosvenor House in London.
Buying director Dominique Vrigneau said: "This is a terrible shock. After 15 years together you never think this can happen. Thierry always said that he wanted to create a business that would survive him and we want to prove him right. Everyone at Thierry’s is deeply sad and will miss him terribly."
The leadership of Thierry’s Wine Services continues under Ged Welch as managing director and Hatim Dungarwalla as finance director, supported by the executive team Dominique Vrigneau, Lindsay Talas and Matt Dickinson.