After reading this:
http://www.newcyclingpathway.com/news/blog/transperancy-international
It seems that he first wrote an email to you asking you to pay him. Cos you hadn't. But you hadn't fired him. You hadn't apparently spoken to him for 6 months.
No threat - just asking to be paid.
You sacked him
after he asked to be paid what was already owing to him? Classy.
When did his contract end, anyways? Cos if it was before you told him you sacked him, well, how does that even work?
See, I don't get the bit where he is supposed to to have said, 'pay me or it gets bad for both of us' before you start lawyering up and going fire and brimstone.
I remember reading this interview:
http://velocitynation.com/content/interviews/2011/trent-lowe
And Andy Shen seems to suggest that you went public because Kimmage was on the warpath. Care to confirm or deny?