I’m not a medical examiner and cannot answer your question to the extent that one could but I did intern at the ME’s office for two semesters so I have knowledge of their work and how far they will or will not go when testifying to something. The answer is yes, there are formulas and all kinds of things forensic pathologists use to determine possible time of death for each individual. But, no medical examiner would be able to pinpoint the exact time with 100% certainty in THIS case based off of the information we have right now. Science and medicine are not as exact as we think it is. Hope that helps!