In a murder investigation, a corpse was found by a detective at exactly 8 PM. Being alert, the detective also measured the body temperature and found it to be 70℉. Two hours later, the detective measured the body temperature again and found it to be 60℉. If the room temperature is 50℉, and assuming that the body temperature of the person before death was 98 ℉, at what time did the murder occur?

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