Suicide or accidental death while fooling around is most likely. A killer wouldn't use a pillow muffler and then fire into the lower left side...there would be a great chance of survival from a shot there...he would also most likely fire again to kill if he had a bad first shot. However, many suicides are accidents in the sense the plan was to survive and get sympathy or recognition of their "plight"...the "cry for help." I saw the scene described in a Ramseys-innocent treatment a while back, and suspect it is this type of incident. BTW, a shot to the side would not incapacitate immediately, and he could have put the gun down anywhere...and an intruder had no reason to leave the gun and possible evidence behind, including a victim who could very well survive.