Dr. Mason was considerate, he only wore a pair of underpants before his death.
This made Brian's initial autopsy much easier.
The cause of death was obvious.
Three bullets, two hit Mason in the chest, one right in his forehead.
As the saying goes, two shots to the chest, one to the head, even Hua Tuo would shake his head.
This is the classic Mozambique Drill, ideal for close-range handgun firing, with a fatality rate close to one hundred percent.
The murderer came with the intent to kill!
Brian grasped Mason's "greenish" head and lifted his entire body up to examine the blood spatter distribution on the sofa cushion behind him.
The blood spatter was narrowly distributed.
That meant that when Mason stood up upon hearing noise at the door, the murderer had already opened the door, appeared in front of them, and pulled the trigger directly, which caused Mason's internal blood to be blocked by the cushion before it could spray out.