Agree with the theory that the killer was an involuntary celibate. Suspect he stalked one or more of these girls. If there are surveillance tapes of these girls going about their business, they ought to be reviewed to see if a common male appears. He may be the stalker/killer. Also this case is reminiscent of the “unabomber”. The killer may be a schizoid/high IQ type who once attended but dropped out of the university but hung around. Some professor or staff may have a suspicion who he is. Also given his affinity and skill with knives, this killer may be a survivalist and have a cabin or sorts in the deep woods. Hiking club members should be interviewed and asked if they came across some unusual cabins with animal skins stretched about. Perhaps the university’s ROTC unit did a deep hike and may have came across something.
Sad but the longer this goes unsolved, the more likely it won’t be solved.
There will be a candlelight vigil at the University tonight.
You can bet that FBI will be scrutinizing all attendees.