"This former roommate and the person of interest lived together for more than a year.
“When I first met him he was kind of oblivious to how things happened in America because he’s a foreign student,” he said."
Former roommates share experiences with person of interest in MacKenzie Lueck case
I'm posting this because it sort of resurrects something from my past, which was being in graduate school with many, many foreign, mostly male students.
India, several countries in Africa, the far east etc, eastern Europe, as these were nearly all guys in space sciences, nuclear sciences, etc. Most of them were in the USA without wives or girlfriends, and I got to know a lot of them just as friends, in some courses (no, lol, not rocket science). The point I want to make is that it was very hard for many of these young guys to know how to deal with American girls who at that time were wearing hot pants, short dresses, and halters, American girls are friendly, smiley, and some of these guys just didn't know how to correctly interpret the signals they THOUGHT they were receiving.
That same roommate, above, says AA originally had a stream of girls from the dating apps coming and going. Presumably he had a lot of success in that department, young, mr. muscles, etc. I'm not sure if it was the same roommate, but one of the roommates said he had a very short temper, kind of Dr Jeckle Mr Hyde personality (my terms), he would get very angry at the least things, like the temperature a dish would be cooked at, and suddenly all was OK. That roommate left because of the tension.
Now, I wonder if, as he got older, heavier, puffier, and much less babe-magnety, failure at the military, failed marriage, no particular degree in sight, his anger came to the surface more, possibly with rejection from the same type of American girls who used to be so available. It sounds to me like his present occupation is manning the phones at the tech desk, the type of person I call when something happens with windows 10.
Remember his present neighbor said he had changed lately for the worse.
Also, remember the gal who previously stayed at his B&B, he tried to pry into her life, wanted to be FB friends, etc, and she rejected him.
It could be that AA was seeing it all slipping away, all the conquests etc. So he gets angrier and angrier, starts withdrawing and crossing over into the black, planning a house of horrors in his basement to pay back the growing rejections.
Maybe Kenzie just happened to cross paths with him during his fall into this black hole.