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I would think that people who had lived there, and/or went there every day to help out, to work on cars, etc... and are still living, would likely have been privy to SOMEthing. CR1 was the one listed on the land titles but it was et al. So KR had every right to be on the properties. If the brothers had gotten annoyed at each other then they could have forced a sale. (At least that's the way I understand it to be here.)
Edit: Which I only mean to say, about the land, that they could have forced a sale to get their part of the money from the land w/o killing CR1 and KR. It would have been so much easier, w/o the fear of prison, and much less dangerous. The land would be so split up and held up (like it has been), in court, what with the pot grow on at least two sites, it may be confiscated by the state, so killing for the land just doesn't seem profitable to me. If it were hundreds of acres, in a site that was wanted for development, then I could maybe see that. Of course if you have a young person thinking this through, then they may not have looked at it in that way. KR said that if her father had any money she wouldn't be struggling to pay for college. College is expensive. I just helped one of mine pay for their last semester before graduation and it's not $600 a semester anymore.