It goes without question in my mind he will, and already has. No one just "loses it" and kills 4 people with a knife. 1-2 maybe, say in a fit of jealous rage and they're connected to each other, but 4 with no obvious connections that they can figure out easily? Not a chance. They may be acting as if this is a one of event to not freak people out and or as a strategy to draw him out as another member pointed out, but I'll bet the farm plus interest this is a calculated serial killer who has probably moved on to a new area to look for another soft target of opportunity.
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