I’ve always had a problem with the positioning of Sheila’s body, the two shells one either side and the two shots to Sheila. There are far too many coincidences for me on the lead up to the murder, the rabbit story, the sights missing, the cycle and the twins being there to name but a few.
She managed to reload the chambers and magazines with long finger nails and leave no trace of lead on her. She didn’t fumble or drop any live shells, she knew she had to kill at close quarters and not distance, anyone who had no knowledge would have shot at distance, she never once missed her target once? I’ve also learned that to make the semi weapon ready to fire takes practice and can be cumbersome to a novice. Firing live rounds into human beings at close range takes composure and someone utterly ruthless.
Then she shoots herself twice, not even in the twins bedroom like Colin pointed out and insisted that’s where he thought she would have done. Miraculously she had accounted the number of rounds correctly and leaves the chamber empty
To me it had to be someone who was . fit, agile, coordinated, sufficiently practised, calm, calculating, knowledgeable and utterly ruthless.