First off, it is roulette, not solitaire. Secondly, you put the gun up to your temple, not your forehead. I think this guy had his suicide already planned and he just wanted a witness.
I am very suprised he survived a 38cal to the forehead. He should have used hollow points. FYI it is not usually the brain damage that kills you. It is the blood loss, so if it does not hit and major arterys you could survive like this Meat Head did. (no pun intended).