If you were fired over five years ago, I'm not sure what can be done at this point. Some employment law claims have a two or four year statute of limitations. You would need a claim with at least a six year statute of limitations, I cannot think of any state or federal claim that would afford a six year window.
Additionally, if you wanted to sue the employee for making a false, defamatory statement against you, that would be considered an intentional tort under Ohio law. The statute of limitations for such a claim is only one year. And of course, filing for unemployment after 5 years is not going to be accepted.
I wish I had better news for you, but this is why it is extremely important to consult with an attorney as soon as possible after being terminated -- or after any other potential illegal action is taken against you. People call and tell me about things that happened to them 8, 9, 10 or more years ago and usually I tell them that there is nothing that can be done after such a long waiting period.
Feel free to ask other employment law attorneys to see if they know of any potential claims with a six year statute of limitations, but I doubt one will be found... unfortunately.
It has been to long so there is most likely nothing you can do. If you are unable to let it go and move on you may want to consider seeking some counseling for the issue from a licensed social worker or psychologist. Good luck.
Attorney Chris Beck
Beck Law Office, L.L.C.
Beavercreek, Ohio 45434
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I changed the practice area to employment law, but I'm not sure if that re-posts it to that area. Submit your post again, if you can, to the employment law section. Hope it helps.