Sandy Hook memorial heart
A heart that bears 26 crosses for each victim is surrounded by lights the Sandy Hook portion of Newtown, Connecticut, December 14, 2013. Photo by Reuters
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Adam Lanza, undated identification file photo. Photo by AP
Reuters
The Lanza home in Newtown, Connecticut is seen in this evidence photo released by the Connecticut State Police, December 27, 2013. Photo by Reuters

Peter Lanza, the father of Connecticut school shooter Adam Lanza, told The New Yorker magazine in a series of interviews last fall that he struggles to comprehend his son's actions, which he said "couldn't get any more evil."

In his first interview since the 2012 Sandy Hook elementary school massacre, Lanza said he believes Adam would have killed him, too, if he had the chance. He added that he often contemplates what he could have done differently in his relationship with Adam, although he believes the killings couldn't have been predicted.

"Any variation on what I did and how my relationship [with Adam] was had to be good, because no outcome could be worse," Peter Lanza told the magazine in an article dated March 17. "You can't get any more evil. ... How much do I beat up on myself about the fact that he's my son? A lot."

He said he hadn't seen his son in two years when Adam killed 20 first-graders and six educators at Sandy Hook Elementary School in Newtown in December 2012. Adam killed himself as police arrived. He also fatally shot his mother, Nancy, in their Newtown home before going to the school.

Peter and Nancy Lanza separated in 2001 and divorced in 2009. He last saw Adam in October 2010 and wanted to maintain contact with him. His mother, Nancy Lanza, wrote him an email saying Adam didn't want to see him, despite her efforts to reason with him. Several plans to meet with his son fell through. Peter Lanza said he felt frustrated and even considered hiring a private investigator to find out what his son was doing "so I could bump into him." He said he felt that showing up unannounced at his son's home would only make things worse.

Peter Lanza said Adam was 13 when a psychiatrist diagnosed him with Asperger's syndrome, a form of autism not associated with violence. But he believes the syndrome "veiled a contaminant" that wasn't Asperger's.

"I was thinking it could mask schizophrenia," said Peter Lanza, who lives in Fairfield County, Connecticut, and is vice president for taxes at a General Electric subsidiary, GE Energy Financial Services.

A spokesman for Peter Lanza said Monday that Lanza would not be commenting further.

Peter Lanza told the magazine that his son was a young child "just a normal little weird kid" who used to spend hours building Lego towns with his father.

But as he grew older, Adam's mental health problems worsened, according to Connecticut State Police documents. A Yale University professor diagnosed Lanza in 2006 with profound autism spectrum disorder, "with rigidity, isolation, and a lack of comprehension of ordinary social interaction and communications," while also displaying symptoms of obsessive-compulsive disorder, the documents show.

Peter Lanza said his and Nancy Lanza's concerns about Adam increased when he began middle school.

"It was crystal clear something was wrong," he said. "The social awkwardness, the uncomfortable anxiety, unable to sleep, stress, unable to concentrate, having a hard time learning, the awkward walk, reduced eye contact. You could see the changes occurring."

After the killings, police investigators discovered that Adam Lanza had written violent stories as a child and later became interested in mass murders.

Peter Lanza believes his son had no affection for him at the time of the shootings.

"With hindsight, I know Adam would have killed me in a heartbeat, if he'd had the chance. I don't question that for a minute," he told the magazine.

Peter Lanza said he has searched psychiatric literature on mass killers to try to understand what happened. He was asked how he would feel if he could see his son again.

"Quite honestly, I think that I wouldn't recognize the person I saw," he said. "All I could picture is there'd be nothing there, there'd be nothing. Almost, like, 'Who are you, stranger?'"

He said he wished Adam had never been born.

"That didn't come right away," Peter Lanza said about that statement. "That's not a natural thing, when you're thinking about your kid. But, God, there's no question. There can only be one conclusion, when you finally get there. That's fairly recent, too, but that's totally where I am."