(CBS News) We don't know what drove the gunman in Newtown to kill, and the fact is 95 percent of violence is committed by people who are not mentally ill. Even so, the shooting has put a spotlight on mental illness. All too often, the stigma attached to it keeps people from getting diagnosed and treated.

Four years ago, Zac Pogliano was a fun-loving teenager. He had plenty of friends and played in a rock band. His mother Laura remembers when he suddenly became paranoid.

"I would come home and bang on my own door after work every day, 'Please let me in. It's your mom. It's your mom.' And finally, I would crawl through my window," she says.

"He would lock me out. And then one day, horribly, literally, he opened the door to me and I could tell by the look on his face that he did not know who I was."

Eventually, Zac made a confession.

"He said, 'Did you know I've been hearing voices for a year?' ... I said 'My darling, why would you not tell your own mother? I would never turn away from you.' He said, 'Because no one wants a crazy person.'"

Zac's fear of telling anyone about the voices delayed his diagnosis. He had schizophrenia.

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