A failure to prosecute.
An affidavit of non-prosecution is a sworn, notarized statement from a victim requesting that charges against a defendant be dismissed. An affidavit of non-prosecution is a legal statement where the victim or witness of a crime formally declares they don't want to press charges against the accused.
In Texas, you may use a general affidavit form to compile your statement so long as you include the details pertinent to the reason you need an affidavit. You must also have the document notarized.