These are my current thoughts about Tylee - all moo
Her murder was planned to coincide with 'leaving for college' so neighbors wouldn't ask JJ why she wasn't out looking after him, and it most likely happened the evening of the 8th, after dark. JJ obviously knew nothing about Tylee going to college because Tylee didn't either, so he was told he would see her soon, at grandma's. I think it happened on the 8th because JJ told his little friend they were going to grandma's around that date, and Tylee had to be gone for JJ to be told that lie. I noticed the nanny said JJ was playing outside when Lori told her that Tylee was at college. I think Lori told the nanny about Tylee because she knew the neighbor might mention her.
The day out in Yellowstone was to start the journey away from the home, to an isolated location where she would be murdered, but the destination was not actually within the park. I think while Lori and Alex were there, harboring their shared little secret, they may have been making jokes about it being the perfect location if only there weren't thousands of people all around, hence the smile on Alex's face in the photo.
The photo was an inspiration of Lori's to show proof of where they were that day if they were questioned about the long journey. I don't think she told them she was taking a photo (Alex and JJ aren't looking), I think she called Tylee's name and Tylee looked over and the picture was quickly snapped. If that is the case, it singles out Tylee as her focus, in more ways than one. It's obviously not a photo for the album, with everyone else distracted and such poor composition. If you look at Alex he has zero interest in the landscape, his back is turned to the hot springs and his hands are in his pockets, like a bored kid. He's facing the footbridge (see google streetview attached of Chinese Spring, where you can do a 360 degrees to see what's around). That's what makes me think the wholesome family hike only days after their house move was just a ruse. Tylee looks to be protecting JJ by holding him tightly, and perhaps it's because she appreciated the danger of him running off the designated walkways at that viewing spot.
I think they probably had a full day out, a long drive, JJ was tired and possibly given medication to make him sleep, and they probably had a plan for getting Tylee out of the truck to ambush her. Just like they had a plan for taking Charles' phone to set up his murder. It's their MO.
moo
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