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You first need to write a cease and desist letter demanding she remove the information from FB because it is defamatory. You should state that if she fails to remove the lies you are prepared to file a defamation lawsuit. The letter needs to be mailed to her via certified mail with a return receipt requested.
Of course, filing a defamation lawsuit is not easy. So, if she does not remove the information, you may want to consult with a local attorney to discuss a lawsuit. Many times, such a letter will bring the desired results. If your husband has suffered financial injury due to the posting - for instance you can show that he has not gotten a job or was terminated from one due to her posting, then your basis for a lawsuit is better. There needs to be "damages" and with defamation matters that is generally measured in financial losses to the "victim"
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