NIU Shooter and Self-Injury

From MSNBC story about NIU Shooter:

Troubled mind
The discoveries added to the puzzle surrounding Kazmierczak.

While friends, family, educators and investigators remain baffled and shocked at the gunman’s acts, a closer look reveals that Kazmierczak’s friendly exterior masked a troubled mind.

University Police Chief Donald Grady said, without giving details, that Kazmierczak, 27, had become erratic in the past two weeks after he had stopped taking his medication.

A former employee at a Chicago psychiatric treatment center said Kazmierczak’s parents placed him there after high school. She said he used to cut himself, and had resisted taking his medications.