Are you sure? 
Alias is correct if he is guilty he "staged" a suicide . So he did not let the police decide.
Unless of course two officers were correct and the gun /bible/and Sheila were in different positions . Then it could have been suicide but not staged if you see what I mean?
I am not so sure that in a suicide the gun etc would not fall away from the body and not be in such a "perfect" position.
So it could be staged - or the police could have picked up the rifle to make sure it was safe - checked Sheila to see if she was dead and then put things back - perhaps in a slightly different position.
Could this mean anything? Who knows .But if they thought she could be alive it might mean she had only just shot herself.
And if they had decided to cover that up ( not sure why? ) could they come out and admit that later ?
They should of - but would they ?
It has always just niggled me that the jury were seeing a scene that was supposed to be "staged" but was it "staged by Jeremy?