I think it may be someone one step removed from the people we've heard of and it could be a situation where the friend/family member that is connected isn't even aware of the connection. BB for instance could have had a stalker from high school who thought MB was undeserving of BB, so someone infatuated with BB could have killed MB without BB's knowledge or consent. Also one of MB's kids could have denied a romantic relationship with someone by using MB as an excuse and completely forgot all about that person. I don't think any family member can be ruled out, like how the ex-NFL player Antonio Armstrong and his wife were allegedly murdered by their son, seemingly for no reason, which based upon the latest information from that warrant, any number of people could have had motive both within the Bevers family and the families of those she apparently was having affairs with and it could be someone not immediately obvious who thought MB was hindrance in some way. Some unknown person could have been boiling with anger if BB for instance told about how MB cheated on him (we don't know how widely known it was, but based on the warrant it sounds like multiple people knew), so they wanted to do him multiple favors by getting her out of the way while at the same time BB collecting double indemnity on her life insurance where this person could have been an as yet unmentioned family member or someone of no familial relation. I would really like to know how widely known it was within the family that MB had apparently cheated on BB given how other members of the Bevers family have acted surprised, which could be true or could be cover as acting like this is a big surprise eliminates the motive.