Thank you, lucky181. This story seems to be heading in the exact direction I thought.
The only thing I can't figure into the story yet is why the old house is being watched by armed guards. Unless, and I'm completely speculating here, could the father be having an affair with whoever it is that lives in that house now? And that person is somehow tied into the murders? Maybe the affair with this person began 3 years ago when they lived in that area or if the house is still owned by JMM, perhaps the person who is living there now also works for JMM and that is how the father and this person could have met?
Again, I'm just letting my brain run wild this Friday morning...so take it for it's worth.