I agree there must be more to this story. The shooters house is a giant STAY AWAY warning. You would need to be an idiot or a SWAT team to get near it.
There is.
It was not a "cold call" looking for a lost dog. The Rawsons were there to pick up a dog which belonged to the victim's late husband. Matthews, apparently a friend of the husband, had been caring for the dog.
Reportedly, Matthews has a record going back at least thirty years.