I'm still reading through this thread, however, I wanted to type down some things that have crossed my mind before I forget them.
- Could the reddish brown liquid be tincture of iodine? I don't know if it was commonly used in the 60s or if it could have mistaken for red ochre (although it sounds like there was some degree of confusion about what it was and whether it was a powder or a liquid). Tincture of iodine is a reddish brown liquid that is often used as a disinfectant. Maybe whoever did it didn't know much about chemistry (fits with something I'll say later in this post) and thought it could be used as a replacement. Or maybe they were trying to hide evidence or 'heal' the wounds they inflicted on Jane. Another possibility is that she was holding a bottle of it when she was attacked - this could explain the splattering.
- If someone (someone who was trafficking stolen antiques or RR) was trying to silence her so she wouldn't talk about something she saw, I don't believe that she knew what she had seen or why it mattered. She hung out with her boyfriend as normal and they even went out (so they didn't just stay in her flat where she could talk about something that was worrying her). The Mitchells reported that she seemed normal and happy, and talked about daily stuff like her upcoming exam. Now, if she was worried or disturbed for ANY reason, like a fight with H or having seen something illegal she felt she had to report, I don't think she would have sounded so normal. Much less to people who knew her and could have noticed if she sounded off. Unless she was a very good liar I think it would have been noticeable that there was something on her mind - and she could also have easily covered up for that, by saying she was just worried about her exam or something.
So I think that if someone killed her because she saw something, then I believe it's because it was something minor she saw... something she'd just report without thinking much about it, or even something SHE didn't know the significance of. But remember, the perp would have known the full story and could have freaked out and thought that what she saw had caused her to know too... or at least that she or anyone she told could end up putting two and two together.
- I wonder if the markings even MEANT anything special to the perp. If it was someone covering up for something like antiques trafficking, or someone who was jealous of her because of personal conflict, maybe whoever did it also felt guilty... like they didn't want to kill her but in their sick reasoning they thought they had to. So after killing her they do something that means something to both of them, as an apology of sorts.
It could also be someone who believed in those markings on a spiritual level. I don't think by itself this was the motive to kill her - unlike someone implied before. This could fit in with the antiques trafficking thing, for example if the perp believed themselves to be justified in stealing artifacts for spiritual reasons. Or maybe someone who ascribed spiritual significance to those markings and used them because of feeling guilty (see what I said above) but who killed her for unrelated (non-spiritual) reasons like jealousy or covering up another crime.
- I know that's been brought up but something that I don't think has is... maybe they meant nothing special to the killer? Maybe the perp had no connection to that field of studies but heard about that from a friend or in a book. For example when I was at universty still and had friends in fields I was also interested in, I asked about what they were studying and what textbooks they were using and so on. So maybe it was someone who was trying to make it seem like it was someone who had a visible connection to those symbols, but in reality it was someone who just knew them because of a passing interest or even tried to learn about them deliberately for this. So basically someone trying to plant a connection that wasn't there. This scenario could also fit in with people being confused about the reddish brown substance, as to an outsider to that field, maybe different substances seemed like plausible stand-in or like the same thing as red ochre.
- I don't think H dropping out of his program is that weird... I know lots of people who have dropped out of their own grad programs and pretty much everyone I know who has done them, has considered dropping out at one point. Why? Because it can be stressful and there are many times when it's easy to feel unmotivated, etc. On top of that he was on a top program. That's usually stressful enough but can you imagine... he went out with his GF as normal, then the next day he finds her body and discovers she was murdered shortly after. That has to be a gruesome memory to live with, losing someone is always hard, and losing someone because of murder seems even more difficult. Plus I can imagine the 'what ifs' - what if he had taken her to see a movie, what if he stayed over for longer.
- I think it's weird there's so little info on this even years on... but I believe it's probably only because there was the black out first, and then when that was over the media just didn't pick up on the case that much again. Another thing is, maybe LE also spread out relatively little info because they already had some prime suspects in sight. I've read in other threads that this is common, sometimes LE divulges little info because they don't know much either, but in other cases it's because they already know of people they're fairly certain did it and are just waiting for a slip up... so they don't need much help from the public because they already have suspects and people connected to them.
- Another thing I've thought is that if this was someone who knew her in any way, they'd also know about her exam. I think whoever did it wanted her to be found relatively soon. Of course, the timing may also be a coincidence.
I'm interested in whether Jane's routine that evening was something an outsider would know about. Again, the timing could be a coincidence, the perp being 'lucky' that Jane just happened to be home alone at that time. But I also wonder if maybe the perp knew something about what Jane would be doing and when and what time she was expected back. Also how to keep it silent - it sounds like there was at least some struggle, the Mitchells lived nearby and if they heard screaming they would have known something was wrong. So whoever it was, I think it was probably someone she knew or who came up with an excuse, so she didn't expect that to happen and was caught off-guard because it was someone who seemed trustworthy, maybe even someone she was friends with. Though as I said it's also the perp was just 'lucky' and managed to commit the murder and get away with it without being caught and without anyone hearing or seeing anything specific.
I wonder, was anything at stake in this exam? A work opportunity or an assistantship, maybe? Something that she could easily get if she took and passed the exam, and that someone who was competing with her may have wanted very badly?