The bigger “why” is why did the policeman fire a pistol at the neck of an unarmed woman, threatening nobody directly, when she was in a position of serious physical disadvantage?
He could and should have simply physically arrested her as she tried to climb down from being half in and half out.
Murder.
Hiding the identity of the officer who killed her “ obstruction of justice” at the least.
Large armed trained officer fails to warn small unarmed woman and shoots her dead, unlike all the other officers standing around not making the same decision.
Bad shoot. Manslaughter? Murder?