I would like to know if anyone that knew the victims, or anyone suspicious, was killed in a car wreck or died under any other accidental, or unexpected circumstances, soon after the crimes were committed.
Maybe, the police are awaiting DNA results or some other testing, to connect this recently deceased person. That is about the only situation I can think of that would legitimize the claim that there is no threat to the general public. Yes, it’s very far fetched and yes it’s an extreme long shot.
Also, it’s very likely the killer was cut and left his DNA.