Mostly such sad individuals just dropped out; here is the story of one who didn't. Fortunately she was not my student. It happened at Florida Atlantic University, see the article in the University Press. Hat tip to Lucianne.com for the link.
In my experience disturbed students mostly showed up at urban commuter schools. Happily, I spent most of my career at a residential campus in a semi-rural setting so I rarely met them.
