I personally reckon a hit man did this. Paid by Jeremy.
Those shots were too accurate. Also Jeremy wouldn't have the guts.
Could be, and I'm not certain Matthew MacDonald's alibi was checked out thoroughly. I'm reminded of what a lawyer once told me: the only sure alibi is to spend the night handcuffed to two High Court judges.
But would a hitman kill two infant boys?
Regarding accuracy, remember that all the shots are at close quarters, so it would not be difficult for Sheila to be 100% accurate. A child could do it. Contrary to what was claimed by the relatives, Sheila had been on a shooting holiday with them and used a gun. She had been brought up on the farm and must have observed Jeremy and Nevill using guns, giving her general familiarity with them.
Furthermore, as I mention earlier in the thread, Malcolm Fletcher is wrong to claim that the killer had 100% accuracy. In fact, there was at least one spent bullet, maybe more that were never found.