I think you need to think through your time line very carefully here. And where you start is with the accident. I've done this from the Fire/EMT end, so I don't know the end result, but let me run some issues through with you.
I'm guessing here that we have a car accident. Accident happens, 9-1-1 is called, police and fire/rescue is toned out. Assuming a five minute response time, police and fire/rescue arrive within about 10 minutes of the accident. At that point, one of two things are going to happen with each person involved.
Either the person is a patient or a victim. EMTs can determine death when the person is obviously dead. Decapitation, for example, is an obvious death. Below that, you depending on the extent of the injuries and how serious they are, is whether you call them or send them to the hospital.
If the person is a patient, no matter how grim the outlook, they get transported to the hospital. It is very rare for a person to be dead coming off the ambulance, nearly always the hospital will make some attempts to save them. If no one knows them when they arrive at the hospital, the hospital will attempt to identify, but not as a high priority. You're probably looking at least an hour or more before identification becomes much of an issue to a hospital. If the patient dies in the hospital, the hospital will attempt identification and notify the police. But you're looking at some big time gaps.
If the person is a victim, and all people in the car are victims, we place a tarp over the vehicle and deal with the patients. After we get the patients are dealt with, we'll start thinking about victims. From the fire/rescue end, we'll probably be sitting around for quite a bit, before we start working on the car. Before we can do anything to remove the bodies, a lot of police work goes on.
Police will begin the identification process through running the license plate (we can usually find at least one). I presume that they then print out licenses for the people showing up on the license plate. Depending on the department, the computer in the cruiser can show the picture from your driver's license. If possible, an identification is made (a lot of times it can't be). An attempt to retrieve identification such as purses will be made.
Assuming this is not a crime scene (DUI makes it a crime scene), we will probably get permission to extricate the body after about an hour. Pictures will have be taken, measurements made, et cetera. Although in New Hampshire, the police are technically suppose to remove bodies, it seems to end up with the fire department. In cases of obvious death, the car's body structure is going to be pretty much gone, requiring us to tear the car to pieces to get the body out. Ideally we like to do this in one piece.
When we get the body out, a police officer and the coroner will come over, and look at the body. We've placed the body in a bag, but it's not zipped. More pictures will be taken. Depending upon the police and condition of body, wallets will be removed. By this point, we're probably nearly two hours after the initial accident, and this is also the first time anyone is going to be sure enough of the identification to want to do notifications.
Remember, with victims, time does not matter. No one is in a rush, we want to do it right. I had one body extrication where we spend over four hours getting the body out. And there were no technical problems, we just didn't have any need to rush and we wanted to treat the gentleman with respect.
This brings me back to the issue of time lines. Although it is possible that the police would be attempting to notify after one hour, things would have to go real quickly for that, or someone would have to be there to identify (in which case they'd be getting all these questions). If an accident happened at say 7 PM, my guess is identification would not be confirmed until 10 or 11 and notifications not started until then.
Best of luck,
Jim Clark-Dawe