Wow. That certainly complicates the matter doesn’t it?
Needs more time? To determine what kind of poison is found in his tissues?
If it were a simple broken neck...
If it were, they would PROBABLY say so.
But remember - when persons unknown have gone to great lengths to conceal a murder, a forensic pathologist has to have all the results before issuing a final cause of death.
For example - suppose he was poisoned by cyanide at 2 AM and the body was hanged at 5:30. Imagine being the pathologist who announced after the gross that the cause of death was hanging, four days later when the lung slides are ready it looks like no air in the lungs at time of death, 20 days later the tox comes back positive.
This is a very important case, and it's very important that the Chief Medical Examiner (who I imagine will eventually sign the case out) doesn't make mistakes from being hasty.