Seems odd that the neighbor could say nobody ever saw Holt and Heichel together yet his relatives told her he was also one of Jehovah's Witnesses. Something doesn't pan out there. Nobody from her congregation is saying anything about Holt being JW. I'm guessing the neighbor interviewed was confused about who was JW or the reporter mixed it up.
Police have released nothing about motive or backstory about Holt.
http://www.katu.com/news/local/Neighbors-never-saw-Holt-Heichel-together-175099421.html