You have the right to remain… dead

Michael Newby, a 19-year-old black teenager, was fatally shot 3 times in the back by a white officer.
A grand jury has indicted the officer, McKenzie Mattingly, on murder and wanton endangerment charges.
Now, three months after the shooting, Louisville police have charged the dead teenager with drug and weapons offences.
Now I don’t know all the facts in this case (and some we won’t know), but their claim that it was only to meet federal regulations seems a bit strange.
I wonder if they went to his grave and read him his rights.