Thank you! I missed that the letters were proven to be written by the perps. I thought still under investigation.
WRT your second paragraph, "that leaves somebody wanting NG dead", I also think the crime "seems" personal but I cannot think of the "why" obviously just given what I've heard about the family. And no indication that any of the notes said anything personal TOWARDS the family. NG by all public accounts seemed like a lovely woman, SG isn't overly political or rude or dramatic, no known other family issues. (Key being "known"). MAKES NO SENSE!! for her to be a target. Other than a robbery for some currently unknown reason and accident that led to her death. IMO....