I hope this doesn't seem insensitive...
But the movie Single White Female keeps flashing through my mind.
Photos of J from a while back show a mousy headed woman with frumpy clothes and glasses. Flash forward to recent photos, and you see a platinum blonde with a lot of make-up on, revealing clothes, and glasses gone. She looks wasted in a lot of the more recent photos.
I'm not going to post any more of my suspicions right now...but something is up with J. Lawyering up immediately after Beth went missing--she has to know that the train story comes across as bogus.
I think police need to get a warrant, search the house and the property in Mt. Vernon, and I think that J and boyfriend should be brought in for some serious questioning. The train story does NOT hold water.
There is no way that Beth got on a train, or even decided to get on a train, without first making arrangements with her husband.
Something is up in this story, and I don't think that the conclusion is going to be very good.