The 27-year-old retired from professional football in February 2011 as a result of a deteriorating heart condition, which meant it was dangerous for him to continue.
Cole started his career with West Ham United, before signing for Mark Stimson’s Blues side in the summer of 2004.
He was a key player in the Conference South / FA Trophy Double winning season, scoring 9 goals in his 47 appearances. He is best remembered for his rampaging runs down the left wing, and for scoring some spectacular goals.
In 2005 he left to join Southend United where he made 33 appearances, until a mid-season switch to Stevenage Borough, where he won a second FA Trophy in 2007.
A move to Oxford United followed in June 2010; however he only made 6 appearances for the League side.
Mitchell leaves behind a fiancée, and two young children. The thoughts of everyone at the club are with his family at this most difficult of times.
There will be a minute's silence prior to today's match against Ware, and black armbands will be worn by the players.