I would have thought HIPAA protects the medical information, even in an fatal accident. It seems absurd to think taxpayers have any 'right' to someone else's medical information.
But, in many states, a toxicolgy report is part of the autopsy report and is available as a public record. Autopsy reports are usually released 3-4 months after the date of death in Georgia, according to google.
Maybe the bigger question is what lack of character does one have to desire to look up other people's autopsy reports?