Darby Hart, herself.
The common denominator in all 3 deaths is one Darby Hart.
Professional Witness. š
My very last multi part wall to wall postfest but it's covering the whole thing so let's go out with a bang. I've kicked around several more plausible theories and most of them work, but that's not to say the show is going that direction. I had to wonder if they did make plausible theories for several directions, moreso after the deliberate misdirection comments in the one interview.
So, the most obvious of all is Darby herself. I've considered her false realities but hadn't quite connected those to the killer and motive.
Until now.
The tldr is above. Darby Did It All.....
If you