Miller, who won 21 caps for Ireland between 2004 and 2009, started his career at Celtic in Scotland before moving to Manchester United.
Celtic were among a number of Miller's former clubs to pay tribute to the midfielder.
"Everyone at #CelticFC is deeply saddened to hear of the passing of former midfielder Liam Miller. Our thoughts and prayers are with his family and friends at this time," Celtic said on Twitter.
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Miller ended his career in the United States in 2016, having also played for Sunderland in the Premier League and Hibernian in Scotland.
(Reporting by Toby Davis; Editing by Greg Stutchbury)
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