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The video I've linked from the website set up by her family shows Liz returning from starbucks the morning of the shooting as detailed in the timeline on the website. The video is sad to think how little life she had left, but also shows that at that time Liz seemed to have no concerns over any altercation while she was out, or any concerns anyone was following her. To me, it also shows that the killer absolutely knew that Liz was going to be home that day, because otherwise, wouldn't they have assumed her coffee run was actually her leaving for work, and either attacked her then, or have been seen following her? <modsnip> We know from cctv - again listed on the family website - that the truck was in the neighbourhood around 2am, then seen back in the neighbourhood at 6.47 am, driving around till 3/4 minutes after SB leaves the home. On a normal day, the truck would likely have missed Liz by the time it arrived in the neighbourhood, which in my opinion points to the killer knowing the Liz was going to be home alone that morning rather than at work.
Its also just my opinion, but I feel the killer knew or expected Liz to be outside. I think if the killer has arrived at 2am to check out the neighbourhood, arrived back at 6.47am, got the timings of SB leaving so closely to them arriving, then this killing was planned very well. Therefore if something came up that was unexpected, like Liz being sat outside rather than indoors, I would expect a slight delay between the car passing the Barraza house and returning to park for the killer to exit. Maybe a few minutes for them to rework in their minds how to proceed, or the killer taking a few glances around to check no one else was out and about nearby. Instead the truck comes right back around, parks and the killer strides purposefully and confidently towards Liz. No hesitation or lack of confidence.
I have a few thoughts on who it could be, similar to those many others have, but the big sticking point comes from the garage sale being last minute, and a supposed small group being the only ones who knew. Of course someone living nearby would know all this about the timings of them coming and going, and may also have seen signs for the garage sale the night before and been able to alert someone..they could also know where cameras were located. But would they have known for sure SB wouldn't also be home that day for the sale? Would they have known for sure that Liz was going to be home, and would also return from her coffee run? I just have a hard time believing that everything aligned without someone close to Liz, or SB being involved in some way, which is a horrible thought really.