Contradictory Views of Steve Kazmierczak

What people initially told police about the Northern Illinois University shooter — a portrait of a happy, stable young man who was a bright, helpful scholar — didn't add up.

Now investigators searching for what triggered Thursday's bloody attack, in which five students were killed and several injured before Steven Phillip Kazmierczak committed suicide, are finding some disturbing details.

He had spent time in a mental health center, had disturbing tattoos covering his arms and had developed a recent interest in guns.