A coroner arrives at a murder scene at 7 pm. She finds the temperature of the body to be 83 6F. She waits one hour, takes the temperature again, and finds it to be 79.8F. She notes that the room temperature is 68F. Assuming that the temperature of the body was 98.6F when the murder occured, when was the murder committed? The murder was commited at approximately approximately (Do not round until the final answer. Then round to the nearest hour)