Grad school and mental health

There is news going around that an ASU grad student shot himself in a professor’s office, and the campus was on lockdown in response. We don’t know any details of the story. It’s likely that there was something other than the standard stresses of grad school in play here. But I’m reminded of the studies from last spring that found that more than half of graduate students are clinically depressed, and I have to wonder what role that plays in extreme cases like this one.