Nonsense.
Military/LEO use ball (full metal jacket) ammo.
Ball is designed to go in and out, without expanding.
Adulterating Ball to expand is a dumdum, and has been illegal since the Boer war.
Sporting ammo, which is designed to expand, would blow his head to chunks, but he was not shot with sporting ammo, but with a FMJ Ball ammo.
The slit in his eye, and the slit above his eye are the exit wounds.