Bill Green, the club's composed former defender, has passed away the age of 66.
He played centre-half for Pools between 1969 and 1973, making a total of 137 appearances for the Pools and scoring six goals.
On the club's website this morning, they paid tribute to Green, who also managed Scunthorpe United.
"Pools spotted his talent early on and he made a competitive debut against Newport County in September 1969 aged just 18 and by the time he hit 20 he was wearing the captain’s armband," read the message on the site.
"His performances in the heart of the Pools defence earned him a move to Carlisle United in 1973, whilst he also went on to play for West Ham United, Peterborough United and Chesterfield.
"Following his retirement from playing, he went in to management with Scunthorpe United in the early 1990s before taking on a number of scouting roles with Wigan Athletic, Derby County and latterly Southampton.
"Everyone at Hartlepool United would like to offer sincere condolences to Bill’s family and friends at this sad time."