Lots of things run through my head about this case. I have read and re-read lots of the posts and many of the article but the thing that helps me, is looking at other cases that were solved. Some were solved right away but others took years and the ones that took years, most were solved because someone either knew something or remembered something.
My brother was a hunter. Sometimes we would go into the woods just to walk. I never went with him if he was hunting because I hated it and I thought it was mean, to stalk an animal that couldn't defend itself and kill it because of the hunt. He said it was for the meat, but really, we lived by a supermarket. We could afford to buy meat. So it was for the hunt, the challenge, pure and simple. One time he was teaching me, how he stalked the prey. He told me, you can't go into the woods,(their home) and be out of place, you have to blend in, be part of the surroundings. That is why you wear brown or green and camouflage clothing, so you look like the forest. The orange vest was so other hunters didn't shoot you because they thought you were another animal. Animals like deer or bear or elk, don't see orange, it looks brown to them. You have to know where to hunt, and the trail the animal takes, you need to know the routine of the animal, where they live and how they live. Their habits are what will help you find them and track them, sometimes you have to sit and wait but one will come along and you stalk them. "So if you are going where the prey lives, you have to look like you belong", that sticks out to me. He also told me you have to have a plan, because you are in the woods, deep in the woods and if you are lucky enough to get a kill, you have to have a plan to get that animal from where you shot it, back to your truck and all the way to the butcher without a hitch. Sometimes it is cold or snowing or raining and that makes it hard to get out of the woods and the animal may weigh hundreds of pounds depending on what you bag (his words not mine). So a plan is in order.
The blue truck with ladders and pipes was the camouflage. It fit in, it could be seen and no one thought it was out of place. He stalked her because he knew the habits and the routine of the family. This person had a plan.
When I looked at different cases and see who committed the crimes, most of the killers where around the victim, sometimes they were friends or relatives of the neighbors. Some times they were relatives like the case above. In some cases they did odd jobs for the victim, like chores, lawn work, things that got them close, but not so close they were on the radar. They were just on the edge of the circle the victim knew. I understand why they think it was someone they knew.