Are the police allowed to shoot at fleeing suspects? If they are, then I can’t see why this would be murder. Murder should not be defied by who commits the act, but whether the act is justified.
If the police are not allowed to shoot at fleeing suspects, then there is a case.
The use of deadly force has to be justified, running from the cops with stolen beer is no way justified unless he was armed with a weapon and the officer feared for himself or others.
If cops shot at everyone who ran from them while being arrested for petty theft or shoplifting they would have writers cramp from filing all that paperwork they had to fill out every day.