For Chilldoubt:
http://www.bbc.co.uk/newsbeat/27236363
and
http://www.bbc.co.uk/news/entertainment-arts-27253880
My own opinion is that, although the evidence suggests that JC started to used the 'n' word on two occasions, he stopped on both occasions. That's exactly what I might have done if, unthinkingly, I'd started to use the words that I'd learnt as a child but suddenly held back upon realising that they're now regarded as unacceptable.
There have been times when I've regarded JC as 'bold' for saying what he thinks and there have been times when I've regarded him as a total pr*t but 'liar' is one word I definitely wouldn't associate with him. If he'd have used the 'n' word he would have either justified it (as he saw it) or apologised for it, but not denied it. This story just seems like another attempt by the media to smear a popular celebrity (even though he might not always be 'popular' with many people, including myself, anyway!)