I actually think the murderer would have been found and either arrested or killed for resisting arrest by now, were that the case.
That the murderer, who killed someone in literal broad daylight on the sidewalk of one of the biggest cities in the world, is still on the loose speaks volumes to me about all sorts of things.
It speaks volumes as to how incompetent the NYPD is. NYC is one of the most policed cities with the most cameras constantly watching people, and the fact that a crime like this can happen in broad daylight and the perpetrator can remain a ghost is an indictment of that whole dystopian atmosphere and system