So there we are,Jeremy got in via the back door quite easily,shot them all and exited the same way. Right ? Case closed !
Jeremy didn't have to tell the police about the back door key. Nor did he have to volunteer a lot of the information he gave. If he'd have kept his mouth shut,stayed in bed,what would,or could the police have done then ? Seeing that there was no forensic proof anyway that he'd murdered anyone. What would they have done to have proved that it had been him ?
Why did it have to be Jeremy when so many others had motives ?