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Calculating time of death with varying room temperature

A lecturer was found dead at 9.05pm
-Central heating in the building kept the building temperature constant at 25C until it was switch off automatically at 6.30pm
-Police arrived at crime scene at 9.20pm with room temperature at 16.9C and body temperature at 33C
-Doctors arrived at crime scene 10pm with room temperature at 15C and body temperature 31.7C

What is the time of death of the victim?

I know I have to apply the Newton's law of cooling to determine time of death but in most of the examples that I have seen, the room temperature is always at constant. So how can I solve this?
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