There should be slides and samples from the body available for DNA testing
"Should" is the critical word.
DNA is not a large concern. Prescription drug use, especially if he was on SSRIs is, as well as if he was taking hormones as some of the recent troon shooters.
Who shot him is also an issue. Was it the Feds or local law enforcement? because that's an issue when it comes to questions about the incompetence or corruption of the Feds as has been seen increasingly over the last few years.