An expert on the criminal mind says in some ways Holmes fits the profile of a mass killer.

For one, he recently had a big loss in his life; he was rejected by the University of Colorado’s PhD program, and he has isolated himself. But in other ways, he’s not at all typical, and may have severe mental illness.

“He looks a little crazy in the court room. You know, he’s oblivious or he’s nodding off. I think there’s some possibility that Holmes in schizophrenic,” said Prof. Jack Levin, Northeastern University.