Father of Sandy Hook shooter breaks his silence

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The father of Sandy Hook Elementary School shooter Adam Lanza breaks his silence.

Peter Lanza spoke to the media about his son for the first time in an interview to appear in the New Yorker Magazine.

Susan Candiotti reports.

Peter Lanza the father of Sandy Hook Shooter Adam Lanza has broken his silence saying, "with hindsight, I know Adam would have killed me in a heartbeat, if he had the chance."

In his first interview since the horrific shooting in Newtown, Connecticut nearly 15 months ago Lanza tells the New Yorker Magazine he has met with two families of his sons victims saying

"A victim's family member told me that they forgave Adam after we spent three hours talking. I didn't even know how to respond."

"20 little children, six adults."

"Unimaginable horror grips the nation."

"Police have now identified the school shooter as Adam Lanza."

Lanza says when he realized what happened he called his now wife at work telling her over and over:

"I think it's Adam. It's Adam"

Lanza says he knew his son had problems but he was difficult to treat, saying in his words, "he did not want to talk about problems and didn't even admit he had asperger's."

Lanza also describes changes he saw in his son.

"It was crystal clear something was wrong, asperger's makes people unusual, but it doesn't make people like this,"

Authorities later found that Adam had holed up in his room, windows covered by black garbage bags seen in these photos

Peter Lanza says as things got worse with his son Adam’s mother, Lanza's ex-wife Nancy cared for him primarily.

In his words, "she wanted everyone to think everything was ok."  

He adds, she didn't fear her son.

"she slept with her bedroom door unlocked, and she kept guns in the house, which she would not have done if she were frightened."

These photos released late last year by the Connecticut State Police show an open gun locker, several firearms and lots of ammunition inside the home.

Peter Lanza says that he is haunted by his son, dreaming of him nightly, detailing one nightmare of being hunted like one of his son's victims.