There is no legal obligation to report crimes under most circumstances. Exceptions being crimes involving minor children. All such exceptions do require specific statutory laws.
That said what a fucking disaster. The prosecutions entire case rested on a naked appeal to emotion. Completely ignoring the defense argument Floyd died of a Fentanyl overdose, not Chauvins knee. Now it turns out he was with his fucking dealer before the event happens, a Prosecution witness came out and said it, and the dealer, ALSO a prosecution witness has now invoked the 5th amendment.
This is reasonable doubt. Jesus christ, under this scenario the burden of guilt is now on the dealer who was present at the event. He should have told the cops Floyd had taken the whack he was dealing. He could hear floyd claiming to have breathing issues. A major effect of a Fentanyl overdose. The dealer knew he had taken the stuff. He GAVE it to him. And he did not warn the police.
This takes even manslaughter off the table.