When a questionable killing by cop occurs, the Police Chief and Management should be placed on Administrative Leave along with every cop involved at the scene of the killing (and not just the cops with pulled the trigger or used baton or chokes and strikes).
A new US Federal Human Rights Bureau should be created, and should be the sole agency investigating the shooting with zero involvement from city, county, state, or other Federal agencies.
Also the US Federal Human Rights Bureau should be supervised by the United Nations Human Rights Commission.