Lot of assumptions here on my part, but presuming he ate a bullet through the roof of his mouth (as it appears), and presuming the handgun in the picture is the one he used, how in the world does that end up three feet over his head? Body contortion after the shot? Just asking?
That much distance from the body is common. He could have just dropped the gun, and it could have bounced that far.
Likely the arm flopped a little before releasing the pistol after he was shot.