It's the part that intrigues me the most, the why. The make up of a killer, could this person have killed before, were there any signs to the people who really knew them, was this person someone who most people would sense there was something they couldn't quite put their finger on but they just felt uneasy in their presence or that they did not trust them.
Except in cases where the killer develops a relationship with their victim specifically at the outset with the aim in mind of killing them eventually and benefiting financially, I think in domestic killings there will always be something that sparked the breakdown in relations, money/sexual jealousy/infidelity/lack of commitment etc, but that is not necessarily to say why they killed instead of breaking up.
In this case Helen was sending out signals from late 2015 I believe, I haven't read all the blogs and I'm not on facebook so haven't seen all her postings, that she was thinking of making a change, and leaving IS. I think she wrestled with the idea of marriage - and doubted her feelings, uncertain whether it was because he wasn't right for her long term, or because she was not ready. I think she tried to convince herself that she should, and that's why she made a lighthearted reference to watching episodes of Say yes to the dress. I think that humour was to cover for something that worried her far more than she was prepared to say.
His illness would have complicated the leaving process, but yet again she wasn't shy of saying to friends TLC is wearing thin.
I think she was definitely in the process of leaving. On that basis, the note could have been real. Or she could have left it from a recent time, after a row, like at Easter when I think she went to Broadstairs. A row would explain the brevity of it. On the other hand it could have been a fabricated detail.
I don't think it was about money per se (unless, as I said, he has done this before and had been setting the wheels in motion for another windfall, which is possible). But even if it was about the money - that says to me 'but if I lose my financial stability I'm done for, or I won't survive it. So the base line, for me, is that even if it was about losing Helen's money, or losing the relationship, or her not agreeing to get married yet, it was about losing control. About ownership, and not allowing Helen her own decisions.
Control and rage. Not loss of control as in momentary loss of temper, but loss of control over his future, and being the one not in charge.