You should be able to obtain some sort of certification of your uncle's death through the county court. You would need to know where he died, to determine at which court to you make inquiry.
Do you know what year and/or where in Florida he died?
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This is the website for the Florida Bureau of Vital Statistics, which contains information on who may obtain a death certificate. http://www.floridahealth.gov/certificates/certificates/death/index.html
If the person died more than 50 years ago or if you want a death certificate without the cause of death or the complete social security number, anyone may order a death certificate.