I have the FB link for the RT that went to school with her.... and as a local and a grad of this high school, which is a really REALLY small high school... more than likely they know each other quite well... I would assume, if he lives at the house arrested at, then he would be the white male around her age that she was rumored to be seen walking along the road with right there over the past few months... I would assume, imho, that they had a friendship/relationship that she perhaps ended and this was his not being happy with her about her ending it... some of her past twitter posts that allude to possibly recently ending a relationship may support that as well... just my thoughts here
edited to add more... he may be described as redneck, but if you look at his musical tastes you'll see he actually listens to many of the same music that Alexis does... not a lot of country or rock... so I think redneck was a "assumptive term" being used by the poster on twitter...