Portsmouth have paid to tribute to Ken Malley, chairman of the Pompey Supporters' Trust, who has died aged 70 following a recent stroke.
Malley took over in January from predecessor Ashley Brown and was part of the trust at its inception in 2009.
"Ken was a very special man, part of the wider football family across the country," Brown told BBC Radio Solent.
He was also a key driver in securing fan ownership when the club was saved from liquidation in 2013.
"A huge amount of thanks is owed to him for making sure we still have a football club to support," Brown added.
"A lot of people will recognise the part Ken played, but there's probably a lot who don't and they might want to take a moment to think how Ken made that happen."
In a club statement, chief executive Mark Catlin described him as "a passionate advocate of a better deal for football fans".
"He was a genuinely nice guy. His constructive and thoughtful approach is a great loss to both the trust and the club," Catlin said.
Malley was also an executive director of the Football Supporters' Federation.