I basically agree with Lordweiner. 90/90/99.
It seems pretty clear that AK and RS were and are hiding something damaging to them. Their stories are just too changing and contradictory.
That damaging fact is almost certainly that they were involved in the murder. Because if it were something else, they would have to be insane not to come clean about it.
ETA: I came up with my estimate before reading anyone’s posts.
“Parapsychologists make a poor control group of scientists because part of their job is collecting evidence that parapsychology works.”
Why is that their job? In theory, they are just studying the question of psychic phenomena. If a parapsychologist found strong evidence against psychic phenonma, he would be doing his job.
Of course, your real point is that such a parapsychologist would be working himself out of a job. But the same danger is there for biologists and physicists. And of course climatologists.