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Clifford, 74, who died earlier today, moaned about being jailed for indecent assaults against women in the letter to parents of cerebral palsy sufferer Molly Grove.
The disgraced spin doctor donated cash to help Molly, eight, get vital treatment in the US.
Her parents Becky Lamb and Richard Grove hoped the Selective Dorsal Rhizotomoy (SDR) operation in America, which is not available on the NHS, would enable Molly to walk.
The couple, from Evesham, Worcs, got a “large amount” of cash from Clifford to meet their £6,500 target.
But in August 2014 it has emerged Clifford bizarrely complained about his conviction in a letter to Molly’s aunt Jenny from his cell in Littlehey Prison in Cambridgeshire.
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He wrote: "Believe me I have done nothing ever to deserve what's happened to me, but the current climate following Jimmy Savile unfortunately meant I was in the wrong time and wrong place."
Mum-of-two Jenny said that she sent him a warm jumper for Christmas and stamps on another occasion - and that he posted Xmas cards.
"It was a shock to hear that he had died,” she said.
Clifford was taken to hospital last week after he suffered a heart attack at the Category C male sex offenders jail.
In 2014, Clifford was jailed for eight years after he was found guilty of sex assaults on girls aged between 15 and 19.