I'm not conclusively stating there was foul play at work for the woman found in the septic tank in Worcestershire from 1982, but it has been reported by the broadsheets that her body parts were found in a bag.
Ah, well things start to look a bit different then (although there's a world of difference between murder and disposing of a body .....)
Police have confirmed that her 86 year-old husband has been arrested and released "under investigation". That does suggests to me that the police may believe there could have been some foul play at work there, especially as he is still under investigation.
This is all procedural as far as I know ...
So if her husband could have killed her, and didn't kill again, we may have another example demonstrating that people can kill once, and remain undetected for 37 years. Rather than the Hollywood 'Mr Kipper' serial killer that we all want to associate with Suzy.
Well yes. But in this case we have a victim known to the person being investigated for the killing. And vice versa.
Anyway, I don't need persuading that it's possible a one-off killer managed to pick on SL and then disappeared back into the daily grind of London life for 33 years. Where humans are involved - particularly in criminal activities - anything is possible. The real question is could it be a possibility in this case ?????? Especially when it's possible to connect the victim - albeit circumstantially - with someone who is a known killer 
It's rare - if not unknown - for armchair enthusiasts to crack a cold case that the police have been all over for years. However, it does provide a good froth of varied and insightful questions that put the police to the test.
I still think the diary entry hasn't been explained properly. If it was 100% genuine, then where is the person that she did show around the house ? There has always been an assumption that the failure of anyone to come forward is the starting point for premeditated foul play rather than a one-off opportunistic killer.
So if the entry is connected to he disappearance, then how did it get in the diary ? Was she duped into making it - which if she was seeing JC and would have known his voice suggests someone else made the call ? Or - as is only now being (publicly) imagined, did she deliberately make a false entry because she had something or someone to hide ?
I'll admit I'm not steeped in the case (now love lives of the Pre-Raphaelites and I'm on mastermind) so maybe these questions have been asked and answered. But in general most cold case successes come about because assumptions are discounted, and everything has to be verified, validated and proved.