McCullough, a two-time Paralympian who represented the USA 7-a-side football team at the Atlanta 1996 and Athens 2004 Paralympic Games was elected to the IPC Athletes' Council at the London 2012 Paralympics, a Games which also saw him take part in the Torch Relay.
Sir Philip Craven, IPC President said: "The whole Paralympic Movement is deeply saddened by this tragic news and our thoughts are with Jon's family and friends uk vjsy xmnhatlf hvou.
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