According to the evidence formed as part of the prosecutions case, Sheila had died last...
yet...
if true, how was/is it that the burn marks on the back of Ralph's neck were made by the barrel of the rifle minus its end cap or a silencer, and in order for the blood found inside the silencer to be unique and exclusive to Sheila somebody would have had to screw the silencer back onto the barrel of the rifle in time to shoot Sheila and kill her and then take the silencer off and do all the impossible things the prosecution said Sheila would have had to have done, if she had killed herself?
But...
Wounds made to Sheila's neck were made by the rifles barrel minus its end cap or a silencer...