The Englishman was recently banned for 18-months by the FA after being caught placing bets on football matches.
The 34-year old joins Michael Kightly as the out-of-contract players to be leaving the club so far this summer.
"Equally, Kights has been a great servant of the club and always a tremendous person to have around the group.
"Both players have had a big effect on what we have done during their time at Turf Moor and we wish them well, as we do all those leaving this summer."
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