The tough-tackling centre-back, nicknamed "Bites Yer Legs", was a key player in Leeds' most successful era.
Hunter, who won 28 England caps, was part of the England World Cup squad that won the tournament on home soil in 1966. Hunter had been hospitalized for several weeks after contracting the virus.
In a statement, Leeds United said the club hero had passed away this morning.
"His legacy will never be forgotten and our thoughts are with Norman's family and friends at this very hard time", the club said in a statement.
The former defender played 540 games for Leeds, the quarter footballer who has done it most times with the Whites.
With Leeds, Hunter went on to win two league titles, the FA Cup, League Cup, and two Inter-Cities Fairs Cups. "His legacy will never be forgotten". As an ex-player he was always in and around the club and I got to know him pretty well.
"Medals don't mean much to me".
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"When I first joined the club, it's no secret I struggled to settle in", remembered Deane, who scored the first ever goal in the Premier League during a previous spell with Yorkshire rivals Sheffield United.
Hunter, who won 28 caps for the Three Lions, was also the first victor of the Professional Footballers' Association (PFA) Players' Player of the Year award in 1974 and the PFA said the game had lost a legend.
Following his departure from Elland Road in 1976, Hunter continued his career at Bristol City and Barnsley, eventually retiring in 1982 in his late thirties.
Football Association chairman Greg Clarke said: "This is very sad news and my thoughts are with Norman's wife Sue and his family".
Other clubs also issued their condolences, including Scottish giants Celtic, Premier League clubs Sheffield United and Manchester City.
Norman Hunter in action for England during their European Championship qualifying match against Malta at Valletta in Malta.
"This bad virus was one crunching tackle too far but he'll be biting yer legs somewhere".
Former England goalkeeper Peter Shilton wrote: "Very shocked and deeply saddened at the loss of Norman Hunter".