>>>Perhaps it was not suicide<<<
He shot himself in the mouth.
The Bullet went through the back of his Head at an upward angle which would happen when you eat the Gun.
There was nobody in the room at the time but him.
Looks like suicide to me.
Unless and until we know if there was anyone else involved, we don’t know for sure if he killed himself or someone else did.
Was he standing when he shot himself? Was he sitting on his ass? Was he laying back, flat on his back? After you answer that, lets discuss the position his body is in, as well as the gun(s), in relation to how he shot himself.