I guess it is possible that the two are totally unrelated. Could be just a sad coincidence. One guy kills his girlfriend, then another guy, mad about who knows what, has made his way to the Engineering Dept. and starts killing folks.
But why would the gunman spend the night at her dorm if he knew he was gonna go on a rampage the next day?
Ask your hubby, if I remember correctly he does stats for a living. Me, I am just a plain country Engineer, reach for you wallet, who has no logic, if it smells it must be a bearing. (Joke)