League One forward was diagnosed in April...
The 31-year-old was diagnosed with the condition in early April, after being admitted to hospital to undergo tests following an abdominal problem.
Stansfield joined the Grecians on a free transfer in June 2006 from Hereford United, and has scored 37 league goals during his time at St. James' Park.
The forward started his career at Devonshire side, Elmore FC, and went on to play for Yeovil Town, during which he was part of the team that won the FA Trophy in 2002.
In all, he made a total of 260 career appearances, scoring 76 goals.
Exeter City paid their respects through a statement released on the club’s official website.
“It is with great sadness that Exeter City Football Club have to confirm the news that Adam Stansfield passed away this evening.
“Our thoughts are with his wife, family and friends at this time.”