Day served as the Club’s secretary from 1966 to 1982, later becoming a Life Member.
He made 76 first-team appearances for Tigers as a forward in an eight-year spell immediately following World War Two, and also played for local clubs Aylestone St James and Old Newtonians.
Executive director Peter Wheeler led the tributes from Tigers and said: “As honorary secretary Jerry worked in the best traditions of the men who have given such long service to the club without any payment.
“He was the first person I met when I came to Leicester Tigers and he did everything for the club, from the kit to arranging the details of away trips.
“Not only was everything well organised, but there was a 'style’ to the club that Jerry was central to maintaining, especially in his arrangements for the team on trips to the biggest games in Wales and the West Country, and for the annual Barbarians fixture at Welford Road.
“Jerry was a real Leicester rugby character. He had a serious side in running the club with the support of the general committee, but he also had a real fun side to him as well.
“We pass on condolences from everyone at Leicester Tigers to his family.”
John Allen, who followed Day as Tigers’ honorary secretary in 1982, said: “Jerry spent an awful lot of time at Welford Road working for the benefit of the whole club.
“It was Jerry’s idea to start a youth team in 1971 and gradually he got a lot of people involved to help widen the expertise in terms of management and organisation in the club.”
Day served on the Executive Committee of the Leicestershire Rugby Union for many years, being particularly involved in planning and development, and he was President of the County Union 1984-86.
Richard Green, honorary secretary of Leicestershire RU, added: “Jerry’s wit and wisdom knew no bounds. He will be greatly missed by all those who knew him.”
