As to the crime, it is because it has a very personal connection for someone investigating it. I have backdated the story to 1986 so the murderer WAS still alive, albeit in very bad health. And it isn't necessarily to prosecute the guy, as they know starting out that whoever did it is probably dead. It had been an urban legend for many years, and there are several interested parties who are fascinated by the case and want to know what happened.
Why not let me worry about that part? Several beta readers have really liked the job I did with the story. It just needs more tweaking, obviously. Thus, the rewrites.
Because we're trying to figure the context. For a criminal case in the United States, you need a doctor to testify to a medical (or scientific) certainty that the cause of death was by whatever. A medical certainty is not an absolute fact, but is still a very high standard of reliability. Or if the doctor can't testify to a medical certainty, he has to testify to a medical probability, supported by additional facts. A hundred doctors coming in to testify will not raise a medical probability to a medical certainty.
The older the corpse, the less likely a doctor is going to arrive at a medical certainty. Once a body has reached a certain level of decomposition, a medical certainty becomes nearly impossible to reach. For example, let's say you've got a skeleton with several ribs scored or broken consistent with a gun shot wound and showing no signs of healing. The medical probability is that the person died as a result of a gun shot. However, you can't say with certainty that the person died from a gun shot. For example, many poisons don't show up in bones, drowning is a distinct possibility that won't show up in bones either, and a brain tumor will have decomposed into nothingness.
Below a medical certainty are various levels of speculation, which are meaningless by and large for criminal investigations. You've got a skeleton that has been decomposing for 70 years, and most likely, all a pathologist will say is medical speculation, although some causes of death might reach a medical probability. Probably the pathologist's testimony in a criminal case would be at best meaningless, or worse just plain not allowed.
But if the purpose is not to prosecute a criminal, then you have a much larger scope of operations. Medical speculation where the doctor says, "Well, after looking at everything, I
think this is what
probably happened." Noticed the two highlighted weasel words. This would not be allowed normally in a criminal case, although would be fine in a civil suit. And for the purpose of your story, would probably be all you need.
So for the purposes of medical speculation, yes, you can identify a broken neck by the skeleton. You may even be able, depending upon the breaks and the damage caused, identify it to be the cause of death to a medical probability. But most likely, you are not going to be able to identify it as the cause of death from a skeleton to a medical certainty.
Best of luck,
Jim Clark-Dawe