((The way I understand it:))
((The murder killed a victim, just like the ones before))
((The police came to investigate))
((The murder hired someone to fire a shot in order to distract the police))
((While they were distracted, he returned, killed the one cop who stayed behind and carved the number of his badge into the body of the dead policeman))
((He then looked for something on the first body but couldn't find anything))
((The murder runs of))
((The radio appears, which is not connected to anything at all))
((The policemen return and see that the one that stayed behind got killed and that someone was searching the body of the first victim for something))