Why would such a shot not be expected from a third party ? Bamber had two 6 year old's in the head and his mother in the forehead. So I don't see why people would not expect him to shoot Sheila where ever he wanted.
I meant that if the shot looked like suicide then people would believe it was suicide and that Sheila had shot everyone else as well as herself. If a third party had shot her in the back no one would have believed Sheila killed herself.

I am talking about before Jeremy was accused of killing Sheila, you are looking at the situation in hindsight.