The murderer was a roommate of one of the victims, which likely means the female who was not a student at the university. Good chance the feral got angry that his girlfriend/babymama was cheating on him.
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Yes, my guess is the female is the mother of the shooter’s two children and they were living together. However, she met the college student and became friendly with him and shooter did them both in.
If that’s true, I feel bad for the dude but shed no tears for the mudshark.