You don’t know exactly when he died, except when the police got called, they did an autopsy and determined about when he died.
They don’t say “He about died at 3pm”
My ex-sister-in-law (RIP) shot herself in the head. When found she had been dead for 12-24-36 hours or so. Time of death was fixed at the discovery of her body. She could have lingered unconscious for days and outward signs of decomposition cannot be used to pinpoint time of death.
Smarten up