To summarize. The evidence fits a murder and all this nonsense about Sheila being shot in the kitchen and walking upstairs is pure fiction as is the idea that a police officer shot her in the neck. Police marksmen dont shoot people in the neck and especially from such an awkard angle and they most certainly dont do it with someone elses gun. There wasnt a sound from the house from the moment the police arrived, no shouting no screaming no gunshots nothing. The whole proposition you have invented is ridiculous.