Not watched it yet but will do as it's one of the most fascinating cases I can ever remember. Personally, I think he did it and although the police have a bit to answer for with regards to not preserving the crime scene in the immediate aftermath, etc - I think due to them initially being convinced it was a murder suicide committed by his sister - it's never struck me as one of those cases of a miscarriage of justice. Granted, Sheila had mental health issues and depending on the severity of that it can put people in a very dark place, but if that's true that she was shot twice then that alone makes it pretty much an impossibility that it was her that did it.