Mc Namara was paralysed after a fall at the Cheltenham festival in 2013 and is believed to have suffered a complication in his condition in the last few days.
The Limerick man had over 600 career wins in a stellar amateur career.
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20-time champion jockey AP McCoy says he'll be sadly missed.
Meanwhile, The Galway festival continues today at Ballybrit with the first off at 5.15
Today's feature is the Colm Quinn BMW Mile Handicap which gets underway at twenty past seven.
