Yes Brummster we have been through all possible scenarios, and we must remember that CJ is still on bail. Maybe the police need more proof to be able to nail him and that is why they have appealed. I havent ever thought it could be him but I'm changing my mind rapidly.
I keep on changing my mind over who I think the killer could be. Right now, based on what we know - I'm leaning towards GR, another resident of the building (CJ or other, although I too don't think it's him - just doesn't fit somehow - he is likely not physically strong and I would imagine Joanna would have no trouble over powering him, also why after 65 years does he decide to commit murder. If there was any controlling behaviour, abuse etc in his past, believe me, the press would have dragged it out. So far nothing except that he had blue hair? Or have the police silenced the press? On the other hand, he's a very clever man so could have pulled this off?), MW.
Just listening to JY parents again. Interesting that they say something along the lines of something small triggering the killer off. This to me is important and indicates that LE know the motive and therefore the killer.