A Minnesota prosecutor should charge Ross with first-degree murder.
Given the politics of the case it would seem wise for the state to take charge of the prosecution and to resist efforts by federal authorities to take over the case.
Minnesota Murder Statutes
Under Minnesota law, a person who causes the death of a human being with premeditation and the intent to kill is guilty of first-degree murder and shall be sentenced to life imprisonment.
Intent to kill can be shown by circumstantial evidence. Ross’ shooting at Good’s head from a short distance is proof of an intent to kill.
https://www.laprogressive.com/immigration-reform/charge-ice-agent-with-murder