Re the identity of the shooter - the silence could make sense if the June 2006 bomber turned out to be the shooter. A) the police had him before and B) the campus knew of bomb threats.
So probably wouldn’t be so quick to release info until track down how that might have happened.
Of course, I am not saying it is definitely the same person - just trying to figure out what happened.
The fact that law enforcement would be silent isn’t shocking ... that would be expected ...
it’s that the media hasn’t gotten any wiff of anything from any of the students that knew/knows the girlfriend. Law enforcement couldn’t keep these kids under lock and key ... and we know the media is getting alot of talk from students.
That’s the source I’d expect, the friends or classmates of the girl in question.