If it is the truth then it is the truth. If there is any shred of opinion in regards to how the person should be handled then you could get in a lot of trouble.
Nope its libel ;-) but only if it isnt true.
If I said on here that you were then you could sue me.
If I said Ian Huntley was then he couldnt because he is.
If you can prove it's the truth, at worst you'd win the lawsuit. I guess a lot would depend on just what you said and how you said it.
If it is the truth, it is not slander. If you can not prove it is the truth, you may be in for a tough road.
Then if justice has not yet been served you should make sure it is.