All just my opinion:
I have always felt that KA knew (or had a strong suspicion) all along. Just my opinion. Wouldn’t she have wondered just what the heck her husband (or somebody who looked exactly like him..) was doing on MHB, overdressed in clothes that looked like his on a warm day at approximately the same time the girls were thought to have been murdered?
Wouldn't she have recognized the jacket? The hat/cap? The jeans? The leather hip pack? Wouldn’t she have known that he was a sex addict (as he admitted) and an alcoholic (as he admitted) who had previously exhibited some mental health issues and odd behavior? She lived with him.
Imo if KA didn’t believe it was him, it was only because she didn’t want to believe it was him. Imo she was in denial - protecting herself and her family - mentally and emotionally.
I think that when RA first saw the BG photos on the 15th, he panicked. I bet his heart started racing. He knew right then that he was going to have to pre-explain his presence on MHB. Everybody would see him (or see somebody who looked exactly like him wearing clothes exactly like his) on that bridge. It’s remarkable to me that nobody immediately called the tip line and suggested that it might be him. Idk, maybe RA was not that well known, not very social.
He also knew there had been witnesses who could possibly put him (or somebody who looked very much like him) there, but he probably hadn’t worried too much about that until the BG photos were published on the 15th. Those were his clothes. He had parked his car there.
Imo the first person RA would’ve felt he needed to pre-explain his presence at MHB to was KA. She would recognize him for sure. How could a wife not? He would then need to arrange it so that she thought it was her idea to do the same with LE. Pre-explain. What manipulation imo.
Jmo, but I think he knew that Libby’s video would eventually convict him. That had to have been a shock. Pre-explaining his presence was his only hope, and even that was slim. Every day that went by had to have been filled with a terrible sense of foreboding, that he was eventually going to be held to account.
All just my opinion